1) Whether a Constitutional challenge to the imposition of a new sentence on revocation constitutes, an "improperly raised collateral attack" on the underlying conviction and sentence?

2) Whether the district court relied on impermissible factors in revoking Mr. Simpson's Supervised Release term, sentencing him, and imposing a new term of supervised release.

Whether a constitutional challenge to the imposition of a new sentence on revocation of supervised release constitutes an improperly raised collateral attack on the underlying conviction, and whether the district court relied on impermissible factors in revoking supervised release and imposing a new sentence