Update: Now Sen. Burr denies saying this. But the AP stands by its story.
Further update: The venerable conservative publication National Review weighs in against the other leading Republican candidate– mostly because he’s not reliably conservative enough:
Additional update: Trump just can’t see to break his disturbing habit of retweeting stuff from racists and antisemites:
Donald Trump retweets user "WhiteGenocide" whose bio lists him as living in "Jewmerica" https://t.co/cF8cF1WE8N
— Yair Rosenberg (@Yair_Rosenberg) January 22, 2016