Natives and citizens of Senegal, siblings Ajaraton, Aminata, Adja, Hamza, Ibrahi-ma, Aissatou, Yakhoub, and Mouhamadou Mbengue and their cousin, Ibrahima Lo, (“petitioners”) petition for review of a Board of Immigration Appeals (“BIA”) order dismissing their appeal of an immigration judge’s (“IJ”) decision denying their applications for asylum, withholding of removal, and relief under the Convention Against Torture (“CAT”). 1

In their brief to this court, the petitioners do not specifically challenge the BIA’s order but instead assign error only to certain aspects of the IJ’s decision. The petitioners first argue that the IJ improperly *977 discounted a recent State Department “country report” that the petitioners claim demonstrates worsening human rights conditions in Senegal. They also contend that the IJ’s adverse credibility determinations regarding the petitioners were unfounded because the IJ allowed Government counsel to badger the petitioners during cross-examination and confuse them with questions about other petitioners’ testimony. Finally, the petitioners argue that the IJ erred by misapplying the distinct legal standards of eligibility for asylum and withholding of removal.

This court lacks authority to review the IJ’s alleged errors. “When considering a petition for review, this court has the authority to review only the BIA’s decision, not the IJ’s decision, unless the IJ’s decision has some impact on the BIA’s decision.” Wang v. Holder, 569 F.3d 531, 536 (5th Cir. 2009). Here, the BIA conducted a de novo review of the record and did not merely adopt the IJ’s findings, so our review is limited to the BIA’s order. See Girma v. INS, 283 F.3d 664, 666 (5th Cir. 2002). The BIA tracked the IJ’s findings, but it also assumed the truth of petitioners’ testimony while concluding that the testimony was too vague and bereft of factual support for their claims of withholding or asylum. Consequently, in failing to challenge the BIA’s decision, the petitioners have waived the only issues properly before this court. See United States v. Thibodeaux, 211 F.3d 910, 912 (5th Cir. 2000) (“It has long been the rule in this circuit that any issues not briefed on appeal are waived.”). Accordingly, the petition for review must be DENIED.