Ex Post Facto Clause-application

QUESTION(S) PRESENTED This Court provides that the Ex Post Facto Clause applies to any change in the law that creates a significant risk of a higher sentence, including changes in the Sentencing Guidelines. The 2011 Amendments to the U.S.S.G. § 1B1.10 caused Mr. Harrison to lose the benefit of the 2000 Guidelines Amendment Number 599. Should the district court have applied Amendment 599 to Mr. Harrison's pre2011 sentence? v i.