Donald Trump has lashed out at “Birdbrain” Nikki Haley after the former U.S. ambassador to the United Nations won her first Republican primary in Washington D.C.

The former president accused Haley, Trump’s only serious challenger left in the GOP primary, of being a “loser” after she won Sunday’s race by 62.8 percent to 33.2 percent.

This is a breaking story. More to follow.