In classic Trumpian fashion, The Donald opened his remarks (or rather remark) on birtherism with a lie — that Hillary Clinton started "the movement" — and he ended them with a lie — that he finished it.
Having gotten away with lunatic theatrics for months, Trump's one-sentence birther chat just now was his first major miscalculation. He pampered his fanatical base but no one else; he needlessly reopened old wounds; he reconfirmed himself as a buffoonish charlatan; and the national media, being under assault for having been too soft on him, is now likely to thrash Trump endlessly for the theatrical sham he just put on.
Trump "finished" nothing. Rather, Hillary Clinton will have the last word, which she delivered earlier this morning:
"For five years, [Trump] has led the birther movement to delegitimize our first black president. His campaign was founded on this outrageous lie. There is no erasing it in history…. He's feeding into the worst impulses, the bigotry and bias that lurks in our country … and Donald Trump owes [the president] and the American people an apology….
"Donald Trump is unfit to be president of the United States."