BOSTON >> U.S. Sen. Elizabeth Warren is mocking Ted Cruz for an email his campaign sent out listing some of the sacrifices Cruz has made on the campaign trail — from time away from his family to sleep deprivation.

The Massachusetts Democrat fired off a series of tweets Tuesday aimed at the Republican presidential hopeful.

In one Warren said, "We're supposed to pity you because trying to be the leader of the free world is hard?! 2 words: Boo hoo."

In another Warren chided Cruz, saying that while he chose to make his sacrifices, working people don't have a choice.

Warren said those making real sacrifices are mothers who drop their kids off at daycare only to find their work hours are cancelled.

The tweets come weeks after Warren criticized Donald Trump.