Gerald Ray Barrow, Texas prisoner #579954, filed a lawsuit pursuant to 42 U.S.C. § 1983 claiming that Mrs. Moore, McConnell Unit mail room, and the United States Post Office interfered with his mail, resulting in lost documents. The district court dismissed Bar-row’s complaint for failure to state a claim and as frivolous pursuant to 28 U.S.C. §§ 1916(e)(2)(B)® and 1915A(b)(l).

In his brief, Barrow does not raise any arguments regarding his claim that appel-lees interfered with his mail. While this court liberally construes pro se briefs, arguments must be briefed to be preserved. Yohey v. Collins, 985 F.2d 222, 224-25 (5th Cir. 1993). This court “will not raise and discuss legal issues that [Barrow] has failed to assert.” Brinkmann v. Dallas County Deputy Sheriff Abner, 813 F.2d 744, 748 (5th Cir. 1987). Barrow has therefore waived any challenge to the district court’s dismissal of his claim that appellees interfered with his mail or otherwise denied him access to the courts as frivolous and for failure to state a claim. See Hughes v. Johnson, 191 F.3d 607, 613 (5th Cir. 1999).

The district court’s dismissal of the complaint for failure to state a claim and as frivolous counts as a strike under 28 U.S.C. § 1915(g). See Adepegba v. Hammons, 103 F.3d 383, 387-88 (5th Cir. 1996). Barrow has previously accumulated two strikes. See Barrow v. Tex. Dept. Corr. et al., No. C-04-496, 2006 WL 2987697 (S.D.Tex. Oct.17, 2006); Barrow v. Swisher County, No. C-04-455 (S.D.Tex. Mar. 16, 2005). As Barrow has now accumulated at least three strikes, he may not proceed in forma pauperis in any civil action or appeal while incarcerated unless he “is under imminent danger of serious physical injury.” § 1915(g).

Barrow’s motions to supplement the record with additional documents and to allow attachments to the brief are denied.

DISMISSED AS FRIVOLOUS (See 5th Cir. R. 42.2 (“If ... it appears to the court that the appeal is frivolous and entirely without merit, the appeal will be dismissed.”)); 28 U.S.C. § 1915(g) BAR IMPOSED; MOTIONS DENIED.