When a defendant's plea was not knowingly and intelligently made, is automatic reversal required?

QUESTIONS PRESENTED 1. When it is undisputed that a defendant’s plea was not knowingly and intelligently made in violation of the Due Process Clause, is automatic reversal required? 2. Relatedly, what prejudice inquiry (if any) applies to appellate review of an unknowing and involuntary guilty plea? 3. What is the definition of “stolen” for purposes of U.S.8.G. § 2K2.1(b)(4)(A), which enhances a defendant’s base offense level if a possessed firearm “was stolen”? ii