Because section 2255 is, in nearly all cases, the exclusive remedy for federal prisoners seeking post-conviction relief, see Caravalho, 177 F.3d at 1178, pro se motions attacking the legality of a prisoner's underlying conviction or sentence are frequently recharacterized as section 2255 motions. See, e.g., Brown, 2007 WL 1378491, at *3; Amin v. Barr, Civ. Action No. 19-3418 (RC), 2020 WL 4049903, at *1-4 (D.D.C. July 20, 2020); Williams v. Gonzales, 567 F. Supp. 2d 148, 149 (D.D.C. 2008); Campbell v. United States, No. CRIM 92-0213-01 (TFH), 2006 WL 1660798, at *1 (D.D.C. May 30, 2006); McLean, 2006 WL 543999, at *1-2. The usual rationale for recharacterization is that the federal prisoner is seeking to collaterally attack his underlying conviction or sentence.