Keith Jones, federal prisoner # 07431-424, appeals the district court’s denial of his 28 U.S.C. § 2241 petition, which challenged the 168-month sentence imposed after his guilty-plea conviction of racketeering. The district court, citing ReyesRequena v. United States, 243 F.3d 893, 904 (5th Cir. 2001), held that Jones had not *380 established that the remedy in 28 U.S.C. § 2255 was inadequate or ineffective to challenge his sentence.

Jones has failed to brief this issue on appeal. Therefore, he has abandoned the relevant issue. See Yohey v. Collins, 985 F.2d 222, 224-25 (5th Cir. 1993).

AFFIRMED.