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Sen. Elizabeth Warren launched a new tweet-storm against Republican nominee Donald Trump Wednesday morning, hours before the final presidential debate of 2016.

Warren responded to Trump's recent claims that the election is rigged against him, telling the nominee that he is losing fair and square. In one particularly colorful tweet, Warren told Trump to put on his "big-boy pants."

It's not rigged, @realDonaldTrump. You're losing fair & square. Put on your big-boy pants because this is what accountability looks like. — Elizabeth Warren (@elizabethforma) October 19, 2016

Give me a break, @realDonaldTrump. You’re not losing because it’s rigged. You’re losing because we see through your creepy bullying. — Elizabeth Warren (@elizabethforma) October 19, 2016

Anyone with children knows that whining about imaginary cheating is the last refuge of the sore loser, @realDonaldTrump. — Elizabeth Warren (@elizabethforma) October 19, 2016

You can’t run a campaign based on hating women, African Americans, Muslims & immigrants & expect to win, @realDonaldTrump. — Elizabeth Warren (@elizabethforma) October 19, 2016

The senator also said voter fraud "only seems to plague places where lots of people might vote for" Democrats.

But @realDonaldTrump didn’t come up with the “rigged” election himself. It’s a longtime effort by the @GOP to delegitimize @TheDemocrats. — Elizabeth Warren (@elizabethforma) October 19, 2016

And @realDonaldTrump’s antics – like attacking judges & calling for his opponent’s imprisonment – echo the @HouseGOP’s witch hunts. — Elizabeth Warren (@elizabethforma) October 19, 2016

Warren and Trump have feuded on Twitter in the past. In July, Warren mocked Trump and his running-mate, Mike Pence. Trump responded several times, labeling the senator "Goofy Elizabeth Warren" and accusing her of lying about her heritage.