Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) began fundraising Wednesday off of Michael Cohen’s explosive testimony on Capitol Hill, saying statements from the former longtime Trump lawyer show that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE violated the law.

The Democratic presidential candidate sent out an email blast asking supporters to sign a petition urging Trump or any future president to not pardon anyone in connection with investigations into Trump.

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“Under oath and in an open session of Congress, one of Donald Trump’s most trusted advisors implicated him in criminal activity while he’s been in the White House,” Warren’s email said.

“Our criminal justice system is hanging on and doing its job – the truth is coming out – despite unprecedented, relentless, and potentially illegal pressure from Donald Trump and his associates in and out of government. But here’s the biggest threat right now: Donald Trump, or the next President, using the pardon power to cover up and permanently excuse this wrongdoing.”

Cohen, a former lawyer who worked for the Trump Organization, testified in front of the House Oversight and Reform Committee on Wednesday. In front of a packed hearing room and cable news cameras, Cohen excoriated the president as a “conman,” a “racist” and a “cheat.”

He alleged that Trump was aware that Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE, a longtime associate, coordinated with WikiLeaks on the dumping of a slew of hacked Democratic documents in an effort to embarrass his 2016 rival Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE. He also suggested that Trump knew about the June 2016 Trump Tower meeting between Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE and other campaign officials with a Russian lawyer offering dirt on Clinton.

Trump has upbraided special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s investigation into possible collusion between Moscow and the Trump campaign, with which Cohen and other former Trump associates are cooperating. The criticisms have sparked Democratic concerns that the president could pardon collaborating witnesses to undermine the widespread probe.

The Democratic National Committee sent out a fundraising blast as well on Wednesday, texting supporters that “Michael Cohen’s testimony makes this clear: Trump is a threat to our country. It’s up to us to make him a one-term president.”

Warren is running in a Democratic primary field that has already mushroomed to nearly a dozen candidates and is facing other contenders who have proven fundraising prowess.

The Massachusetts Democrat made headlines this week when she announced she would skip high-end fundraising events and phone calls with wealthy donors.