Whether § 2255 permits a sentencing court to deny a successive motion merely because the prisoner again seeks similar relief.
Holding
No. The phrase “similar relief” must be read as substantially equivalent to the successive-petition rule governing federal habeas corpus, not as a broad res judicata bar.
Reasoning
Section 2255 was enacted to provide federal prisoners a collateral remedy as broad as habeas corpus, but in the more convenient forum of the sentencing court. Reading “similar relief” literally would allow a court to bar a later motion even when it rested on an entirely different ground, simply because both motions sought release or correction of sentence. That reading would make § 2255 materially narrower than habeas corpus and create serious constitutional concerns.
The Court therefore treated § 2255's successive-motion language as the functional equivalent of § 2244. Traditional res judicata does not govern habeas or § 2255 litigation because the judiciary must remain able to examine alleged unlawful restraints on liberty. Still, courts may use sound discretion to prevent repetitive litigation and abusive use of collateral remedies.