This June 18, 2015, file photo, provided by the Charleston County Sheriff's Office shows Dylann Roof. Attorneys for the man charged with killing nine people at a Charleston church are challenging federal prosecutors' intention to seek the death penalty against him. Lawyers for Roof argue in a motion filed Monday, Aug. 1, 2016, that the death penalty and federal death penalty law are unconstitutional. (Charleston County Sheriff's Office via AP, File)