Elizabeth Warren ripped her Republican counterparts as the Senate braces for President Trump's impeachment trial.

The Massachusetts senator and 2020 Democratic presidential candidate reflected on 2019 during a New Year's Eve address in Boston, asserting that Trump had "become bolder with his lies and more brazen in his law-breaking."

"Meanwhile, the Republicans in Congress have turned into fawning, spineless defenders of his crimes," she said Tuesday at the Old South Meeting House.

Trump this month was impeached by the House for abuse of power and obstructing Congress after allegations he pressured Ukraine to dig up political dirt on another 2020 Democratic rival, former Vice President Joe Biden.

"It brought no one any joy, but the House Democrats upheld their sworn duty to the Constitution and impeached the president of the United States. Soon I will return to the Senate to do my sworn duty as well," said Warren, 70. "But unless some Senate Republicans choose truth over politics, Donald Trump will be emboldened to try to cheat his way through yet another election."

Warren will join Sens. Michael Bennet of Colorado, Cory Booker of New Jersey, Amy Klobuchar of Minnesota, and Bernie Sanders of Vermont in taking part in Trump's Senate trial, during which the Democratic White House hopefuls will be expected to be in Washington, D.C., six days a week rather than on the campaign trail ahead of the Iowa caucuses on Feb. 3.

Republicans weren't Warren's only targets on Tuesday. The liberal firebrand, who launched her exploratory committee exactly one year ago, knocked her opponents for running on more center-left platforms.

"Those moments in American history define us. And at each one of them, if our leaders had approached the moment thinking small, we would not have made it through. Americans do big things. That’s who we are. And our best moments as a country have been when we see a challenge clearly, and we mobilize to meet it head-on," she said, referring to the Revolutionary War, the Civil War, and the Great Depression.