Less than a week before the New Hampshire primary, Donald Trump is calling Ted Cruz a cheater.

FOX's Rachel Sutherland reports from Washington:

Trump is accusing Ted Cruz of stealing the Iowa caucus, pointing to rumors the Cruz campaign spread about Ben Carson dropping out of race, which turned out not to be true.

(Cruz) "I think they should probably throw him out of Iowa because what he did was a disgrace."

Cruz apologized to Carson, but he blasted Trump, saying he's "losing it" and is throwing a "Trumpertantrum".

(Cruz) "Donald Trump guaranteed a victory in Iowa and then he lost and he doesn't like that."

Poll averages show Trump with a 20 point lead in New Hampshire.

In Washington, Rachel Sutherland, FOX News.