Taylor v. United States

Issue: (1) Whether the U.S. Court of Appeals for the 6th Circuit erred when it affirmed the exclusion of the petitioner"s expert rebuttal testimony regarding his future dangerousness in violation of Kelly v. South Carolina, which recognized a capital defendant"s broad due process right to rebut any "implication" or "inference" of dangerousness "from the [government"s] evidence," and misread the record, which plainly shows that the petitioner"s expert testimony would have rebutted not only the government"s evidence but also its summation arguments; and (2) whether, after the Supreme Court invalidated the definition of a "violent felony" in the residual clause of the Armed Career Criminal Act in Johnson v. United States, the definition of a "crime of violence," 18 U.S.C. § 924(c)(3)(B), is unconstitutionally vague.