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BOSTON (AP) – Elizabeth Warren fired off a series of tweets Tuesday mocking her U.S. Senate colleague Ted Cruz for an email listing sacrifices Cruz has made on the campaign trail — from time away from his family to sleep deprivation.

“Are you kidding me,” Warren said in one tweet, “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 the Republican presidential hopeful from Texas saying that while he chose to make sacrifices, working people don’t have a choice.

Warren, a Massachusetts Democrat, pointed to mothers who drop their kids off at daycare only to find their work hours canceled — a problem she said Republicans haven’t helped to address.

“Working people work more, get paid less, can’t save, get mistreated, struggle with illness & family — but they don’t whine,” Warren tweeted.

Alice Stewart, a spokeswoman for the Cruz campaign, said the campaign had no comment.

Warren posted an image of the fundraising email.

In it, Cruz talks about constant attacks and says spending “almost every day on the campaign trail means precious little time spent with my wife, Heidi, and my daughters.”

He also said “fighting morning and night for the future of our country ensures long nights and early mornings resulting in little to no sleep.”

Warren responded, tweeting “Know who’s facing “constant attacks,” @TedCruz? Hardworking American immigrants, Muslims, LGBT folks, women. Your constant attacks.”

“Know whose sleep is limited?” Warren added. “Working parents who stay up worrying about getting kids thru college w/o big debt.”

The tweets come weeks after Warren criticized Republican front-runner Donald Trump in a series of tweets.

She has not made an endorsement in the presidential race.

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