'Bless your heart': Governor dismisses Donald Trump after he calls her an embarrassment

South Carolina Gov. Nikki Haley had a three-word response to Donald Trump on Tuesday after he called her an embarrassment.

"Bless your heart," she tweeted at Trump, the Republican presidential frontrunner.

Trump, the frontrunner for the Republican presidential nomination, has been sparring with rival Marco Rubio for days after the senator went on the offensive against Trump at a Republican debate last Thursday.

Trump went after Haley, one of Rubio's supporters, on Tuesday.

"The people of South Carolina are embarrassed by Nikki Haley!" Trump tweeted.

"Bless your heart" isn't quite a nicety in the South. It's more of a condescending way of dismissing someone.

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