NEW YORK (AP) — Amid high anticipation and sharp criticism, Donald Trump is set to step onstage in Studio 8H tonight to host "Saturday Night Live." Despite a 40-year history of lampooning politicians while inviting some to mock themselves as on-air guests, booking a presidential candidate to host the NBC sketch-comedy show is almost unprecedented. Previously, only eight politicians served as guest hosts. Only one of those — the Rev. Al Sharpton, in 2003 — was actively involved in a presidential bid at the time. (Hillary Clinton appeared in last month's season premiere, but not as the host.) This won't...