Petition of the day

The petition of the day is:

Issue: Whether a person in federal custody is entitled to file an application for habeas corpus under 28 U.S.C. § 2241 because a 28 U.S.C. § 2255 motion is “inadequate or ineffective” to permit him to raise a claim that his conviction or sentence is invalid under an intervening and retroactively applicable statutory-interpretation decision of the Supreme Court.