delivered the opinion of the Court.

The question in this case is whether the Double Jeopardy Clause of the Fifth Amendment was violated by the retrial of the respondent after his original trial had ended in a mistrial granted at his request.

I

The respondent, Nathan Dinitz, was arrested on December 8, 1972, following the return of an indictment charging him with conspiracy to distribute LSD and with *602distribution of that controlled substance in violation of 84 Stat. 1260, 1265, 21 U. S. C. §§ 841 (a)(1), 846. On the day of his arrest, the respondent retained a lawyer named Jeffrey Meldon to represent him. Meldon appeared with the respondent at his arraignment, filed numerous pretrial motions on his behalf, and was completely responsible for the preparation of the case until shortly before trial. Some five days before the trial was scheduled to begin, the respondent retained another lawyer, Maurice Wagner, to conduct his defense. Wagner had not been admitted to practice before the United States District Court for the Northern District of Florida, but on the first day of the trial the court permitted him to appear pro hae vice. In addition to Meldon and Wagner, Fletcher Baldwin, a professor of law at the University of Florida, also appeared on the respondent’s behalf.1

The jury was selected and sworn on February 14,1973, and opening statements by counsel began on the following afternoon. The prosecutor’s opening statement briefly outlined the testimony that he expected an undercover agent named Steve Cox to give regarding his purchase of LSD from the respondent. Wagner then began his opening statement for the defense. After introducing himself and his co-counsel, Wagner turned to the case against the respondent:

“Mr. Wagner: After working on this case over a period of time it appeared to me that if we would have given nomenclature, if we would have named this case so there could be no question about identifying it in the future, I would have called it The Case—

“Mr. Reed [Asst. U. S. Attorney]: Your Honor, we object to personal opinions.

*603“The Court: Objection sustained. The purpose of the opening statement is to summarize the facts the evidence will show, state the issues, not to give personal opinions. Proceed, Mr. Wagner.

“Mr. Wagner: Thank you, Your Honor. I call this the Case of the Incredible Witness.” App. 20.

The prosecutor again objected and the judge excused the jury. The judge then warned Wagner that he did not approve of his behavior and cautioned Wagner that he did not want to have to remind him again about the purpose of the opening statement.

Following this initial incident, the trial judge found it necessary twice again to remind Wagner of the purpose of the opening statement and to instruct him to relate “the facts that you expect the evidence to show, the admissible evidence.” Id., at 82. Later on in his statement, Wagner started to discuss an attempt to extort money from the respondent that had occurred shortly after his arrest. The prosecutor objected and the jury was again excused. Wagner informed the trial judge of some of the details of the extortion attempt and assured the court that he would connect it with the prospective Government witness Cox. But it soon became apparent that Wagner had no information linking Cox to the extortion attempt, and the trial judge then excluded Wagner from the trial and ordered him to leave the courthouse.2

*604The judge then asked Meldon if he was prepared to proceed with the trial.3 Upon learning that Meldon had not discussed the case with the witnesses, the judge gave Meldon until 9 o’clock the following morning to prepare. Meldon informed the judge that the respondent was “in a quandary because he hired Mr. Wagner to argue the case and he feels he needs more time to obtain outside counsel to argue the case for him.” The judge responded that “[y]ou are his counsel and have been” but stated that he would consider the matter “between now and 9:00 o’clock tomorrow morning.” Id,., at 35.

The next morning, Meldon told the judge that the respondent wanted Wagner and not himself or Baldwin to try the case. The judge then set forth three alternative courses that might be followed — (1) a stay or recess pending application to the Court of Appeals to review the propriety of expelling Wagner, (2) continuation of the trial with Meldon and Baldwin as counsel, or (3) a declaration of a mistrial which would permit the respondent to obtain other counsel. Following a short recess, Meldon moved for a mistrial, stating that, after “full consideration of the situation and an explanation of the alternatives before him, [the respondent] feels that he would move for a mistrial and that this would be in his *605best interest.” Id., at 41. The Government prosecutor did not oppose the motion. The judge thereupon declared a mistrial, expressing his belief that such a course would serve the interest of justice.

Before his second trial, the respondent moved to dismiss the indictment on the ground that a retrial would violate the Double Jeopardy Clause of the Constitution. This motion was denied. The respondent represented himself at the new trial, and he was convicted by the jury on both the conspiracy and distribution counts.4 A divided panel of the Court of Appeals for the Fifth Circuit reversed the conviction, holding that the retrial violated the respondent’s constitutional right not to be twice put in jeopardy.5 492 F. 2d 53. The appellate court took the view that the trial judge’s exclusion of Wagner and his questioning of Meldon had left the respondent no choice but to move for a mistrial. Id., at 59. On that basis, the court concluded that the respondent’s request for a mistrial should be ignored and the case should be treated as though the trial judge had declared a mistrial over the objection of the defendant. Ibid. So viewing the case, the court held that the Double Jeopardy Clause barred the second trial of the respondent, because there had been no manifest necessity requiring the expulsion of Wagner.6 The Court of Appeals *606granted rehearing en banc and, by á vote of 8-7, affirmed the decision of the panel.7 504 F. 2d 854. We granted certiorari to consider the constitutional question thus presented. 420 U. S. 1003.

HH l-H

The Double Jeopardy Clause of the Fifth Amendment protects a defendant in a. criminal proceeding against multiple punishments or repeated prosecutions for the same offense.8 See United States v. Wilson, 420 U. S. 332, 343; North Carolina v. Pearce, 395 U. S. 711, 717. Underlying this constitutional safeguard is the belief that “the State with all its resources and power should not be allowed to make repeated attempts to convict an individual for an alleged offense, thereby subjecting him to embarrassment, expense and ordeal and compelling him to live in a continuing state of anxiety and insecurity, as well as enhancing the possibility that even though innocent he may be found guilty.” Green v. United States, 355 U. S. 184, 187-188. Where, as here, a mistrial has been declared, the defendant’s “valued right to have his trial completed by a particular tribunal” is also implicated. Wade v. Hunter, 336 U. S. 684, 689; United States v. Jorn, 400 U. S. 470, 484-485 (plurality opinion); Downum v. United States, 372 U. S. 734, 736.

Since Mr. Justice Story’s 1824 opinion for the Court in United States v. Perez, 9 Wheat. 579, 580, this Court has held that the question whether under the Double Jeopardy Clause there can be a new trial after a mistrial *607has been declared without the defendant’s request or consent depends on whether “there is a manifest necessity for the [mistrial], or the ends of public justice would otherwise be defeated.” Illinois v. Somerville, 410 U. S. 458, 461; United States v. Jorn, supra, at 481; Gori v. United States, 367 U. S. 364, 368-369; Wade v. Hunter, supra, at 689-690; Simmons v. United States, 142 U. S. 148, 153-154. Different considerations obtain, however, when the mistrial has been declared at the defendant’s request.9 The reasons for the distinction were discussed in the plurality opinion in the Jorn case:

“If that right to go to a particular tribunal is valued, it is because, independent of the threat of bad-faith conduct by judge or prosecutor, the defendant has a significant interest in the decision whether or not to take the case from the jury when circumstances occur which might be thought to warrant a declaration of mistrial. Thus, where circumstances develop not attributable to prosecutorial or judicial overreaching, a motion by the defendant for mistrial is ordinarily assumed to remove any barrier to reprosecution, even if the defendant’s motion is necessitated by prosecutorial or judicial error. In the absence of such a motion, the Perez doctrine of manifest necessity stands as a command to trial judges not to foreclose the defendant’s option until a scrupulous exercise of judicial discretion leads to the conclusion that the ends of public justice would not be served by a continuation of the proceedings. *608See United States v. Perez, 9 Wheat., at 580.” 400 U. S., at 485 (footnote omitted).

The distinction between mistrials declared by the court sua sponte and mistrials granted at the defendant’s request or with his consent is wholly consistent with the protections of the Double Jeopardy Clause. Even when judicial or prosecutorial error prejudices a defendant’s prospects of securing an acquittal, he may nonetheless desire “to go to the first jury and, perhaps, end the dispute then and there with an acquittal.” United States v. Jorn, supra, at 484. Our prior decisions recognize the defendant’s right to pursue this course in the absence of circumstances of manifest necessity requiring a sua sponte judicial declaration of mistrial. But it is evident that when judicial or prosecutorial error seriously prejudices a defendant, he may have little interest in completing the trial and obtaining a verdict from the first jury. The defendant may reasonably conclude that a continuation of the tainted proceeding would result in a conviction followed by a lengthy appeal and, if a reversal is secured, by a second prosecution. In such circumstances, a defendant’s mistrial request has objectives not unlike the interests served by the Double Jeopardy Clause — the avoidance of the anxiety, expense, and delay occasioned by multiple prosecutions.

The Court of Appeals viewed the doctrine that permits a retrial following a mistrial sought by the defendant as resting on a waiver theory. The court concluded, therefore, that “something more substantial than a Hobson’s choice” is required before a defendant can “be said to have relinquished voluntarily his right to proceed before the first jury.” 10 See 492 F. 2d, at 59. The court thus *609held that no waiver could be imputed to the respondent because the trial judge’s action in excluding Wagner left the respondent with “no choice but to move for or accept a mistrial.” Ibid. But traditional waiver concepts have little relevance where the defendant must determine whether or not to request or consent to a mistrial in response to judicial or prosecutorial error. See United States v. Jorn, 400 U. S., at 484-485, n. 11; United States v. Jamison, 164 U. S. App. D. C. 300, 305-306, 505 F. 2d 407, 412-413. In such circumstances, the defendant generally does face a “Hobson’s choice” between giving up his first jury and continuing a trial tainted by prejudicial judicial or prosecutorial error. The important consideration, for purposes of the Double Jeopardy Clause, is that the defendant retain primary control over the course to be followed in the event of such error.11

*610. The-Court of Appeals’ determination that the manifest necessity standard should be applied to a mistrial motion when the defendant has “no choice” but to request a mistrial undermines rather than furthers the protections of the Double Jeopardy Clause. In the event of severely prejudicial error a defendant might well consider an immediate new trial a preferable alternative to the prospect of a probable conviction followed by an appeal, a reversal of the conviction, and a later retrial. Yet the Court of Appeals’ decision, in effect, instructs trial judges to reject the most meritorious mistrial motion in the absence of manifest necessity and to require, instead, that the trial proceed to its conclusion despite a legitimate claim of seriously prejudicial error.12 For if a trial judge follows that course, the Double Jeopardy Clause will present no obstacle to a retrial if the conviction is set aside by the trial judge or reversed on appeal. United States v. Ball, 163 U. S. 662.13

*611The Double Jeopardy Clause does protect a defendant against governmental actions intended to provoke mistrial requests and thereby to subject defendants to the substantial burdens imposed by multiple prosecutions. It bars retrials where “bad-faith conduct by judge or prosecutor,” United States v. Jorn, supra, at 485, threatens the “[h]arassment of an accused by successive prosecutions or declaration of a mistrial so as to afford the prosecution a more favorable opportunity to convict” the defendant. Downum v. United States, 372 U. S., at 736. See Gori v. United States, 367 U. S., at 369; United States v. Jorn, supra, at 489 (Stewart, J., dissenting); cf. Wade v. Hunter, 336 U. S., at 692.

But here the trial judge’s banishment of Wagner from the proceedings was not done in bad faith in order to goad the respondent into requesting a mistrial or to prejudice his prospects for an acquittal. As the Court of Appeals noted, Wagner “was guilty of improper conduct” during his opening statement which “may have justified disciplinary action,” 492 F. 2d, at 60-61. Even accepting the appellate court’s conclusion that the trial judge overreacted in expelling Wagner from the courtroom, ibid., the court did not suggest, the respondent has not contended, and the record does not show that the judge’s action was motivated by bad faith or undertaken to harass or prejudice the respondent.14

Under these circumstances we hold that the Court of Appeals erred in finding that the retrial violated the *612respondent’s constitutional right not to be twice put in jeopardy. Accordingly, the judgment before us is reversed, and the case is remanded to the Court of Appeals for further proceedings consistent with this opinion.

It is so ordered.

Mb. Justice Stevens took no part in the consideration or decision of this case.

concurring.

I concur fully with Mr. Justice Stewart’s opinion for the Court. I add an observation only to emphasize what is plainly implicit in the opinion, i. e., a trial judge’s plenary control of the conduct of counsel particularly in relation to addressing the jury.

An opening statement has a narrow purpose and scope. It is to state what evidence will be presented, to make it easier for the jurors to understand what is to follow, and to relate parts of the evidence and testimony to the whole; it is not an occasion for argument. To make statements which will not or cannot be supported by proof is, if it relates to significant elements of the case, professional misconduct. Moreover, it is fundamentally unfair to an opposing party to allow an attorney, with the standing and prestige inherent in being an officer of the court, to present to the jury statements not susceptible of proof but intended to influence the jury in reaching a verdict.

A trial judge is under a duty, in order to protect the integrity of the trial, to take prompt and affirmative action to stop such professional misconduct. Here the misconduct of the attorney, Wagner, was not only unprofessional per se but contemptuous in that he defied the court’s explicit order.

Far from “overreacting” to the misconduct of Wagner, *613in my view, the trial judge exercised great restraint in not citing Wagner for contempt then and there.*

with whom Mr. Justice Marshall concurs, dissenting.

The Court’s premise is that the mistrial was directed at respondent’s request or with his consent. I agree with the Court of Appeals that, for purposes of double jeopardy analysis, it was not, but rather that “the trial judge’s response to the conduct of defense counsel deprived Dinitz’s motion for a mistrial of its necessary consensual character.” 492 F. 2d 53, 59 n. 9 (1974). Therefore the rule that “a motion by the defendant for mistrial is ordinarily assumed to remove any barrier to reprosecution,” United States v. Jorn, 400 U. S. 470, 485 (1971) (plurality opinion), is inapplicable. Accordingly, I agree that respondent’s motion, for the reasons expressed in the panel and en banc opinions of the Court of Appeals, did not remove the bar of double jeopardy to reprosecution in “the extraordinary circumstances of the present case, in which judicial error alone, rather than [respondent’s] exercise of any option to stop or go forward, took away his ‘valued right to have his trial completed by a particular tribunal.’ ” 504 F. 2d 854-855 (1974). I also agree with the holding in the panel opinion that “[i]n view of . . . [the] alternatives which would not affect the ability to continue the trial, we cannot say that there was manifest necessity for the trial judge’s actions.” 492 F. 2d., at 61. I would affirm.