Hmm, so if Trump issued a blanket pardon then no American would have to pay federal taxes or worry about Federal law.
Seeing some possibilities here.
Theoretically, only those Ameticans born as of the day of the pardon, unless of course he issued a blanket pardon for “All United States citizens then living or to be born henceforth for all time, and those naturalized in the future in perpetuity.” That might work I guess.