"Give me a break [Trump]. You're not losing because it's rigged. You're losing because we see through your creepy bullying," the Massachusetts Democrat tweeted.

She added that "whining about imaginary cheating is the last refuge of a sore loser" and that Trump should "put on your big-boy pants because this is what accountability looks like."

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

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The Twitter spat comes as Trump doubles down ahead of the third presidential debate of 2016 on his warning of widespread voter fraud and that the Nov. 8 election will be rigged.

As most national polls show Democratic nominee Hillary Clinton leading in the homestretch, the GOP nominee said Tuesday, "I don't believe the polls anymore."

But Warren argued Wednesday — and in a separate Washington Post op-ed on Tuesday evening — that Trump's claims that the November election is "rigged" stem from years of Republicans trying to suppress Democratic voters.

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