What is the current state of the federal habeas jurisdiction for a federal prisoner to challenge his sentence under Section 2241 of the Criminal Code?

Following the effective date of the Antiterrorism and Effective Death Penalty Act of 1996 ("AEDPA"), Section 2241 is generally used for challenging the execution of a sentence, and a federal prisoner challenging the legality of his detention generally must do so under Section 2255. See Hernandez v. Campbell, 204 F.3d 861, 864 (9th Cir. 2000). Section 2255 imposes several restrictions on habeas petitions, among them a requirement that petitioners obtain leave from the courts of appeals before filing successive habeas petitions. See id. In addition, only the sentencing court may consider a Section 2255 petition. See id. at 865.