Sen. Tim Kaine Timothy (Tim) Michael KaineButtigieg stands in as Pence for Harris's debate practice Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (D-Va.) on Thursday cautioned 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 against using pardons for potential witnesses in investigations amid reports that an attorney for the president's former personal lawyer Michael Cohen Michael Dean CohenA huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr Eric Trump says he will comply with New York AG's subpoena only after Election Day MORE raised the prospect of a pardon with Trump's lawyers last year.

"If you start to see this president use pardon power for people who are connected with this investigation, I think you’ll see Congress erupt," Kaine said in an appearance on CNN's "New Day."

The Virginia Democrat's comments came after Cohen's current attorney, Lanny Davis, told The Wall Street Journal that Cohen directed his former attorney last summer “to explore possibilities of a pardon at one point with Trump lawyer Rudy Giuliani as well as other lawyers advising President Trump.”

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The Journal had previously reported that Cohen's former lawyer raised the possibility of a pardon with Giuliani and other Trump attorneys after an April FBI raid of Cohen's home and office.

Cohen, who worked for nearly a decade as the president's longtime attorney and "fixer," testified last week to lawmakers that he has "never asked for, nor would I accept, a pardon from Mr. Trump."

Kaine indicated the comments from Cohen's attorney give reason to further inquire about Cohen's testimony.

"That’s what Michael Cohen says, and then a current lawyer says a former lawyer said something about what Cohen did another time," Kaine said. "That’s not the same thing as direct evidence that would suggest he’s not being truthful. It’s something I think you’d want to inquire into."

“If you start to see this President use pardon power for people who are connected with this investigation, I think you'll see Congress erupt,” Sen. @timkaine says about report that Michael Cohen's lawyer discussed possible pardon with Trump lawyers https://t.co/8hx2E2uHZy pic.twitter.com/QszbgLv84F — New Day (@NewDay) March 7, 2019

Cohen testified last week that Trump is a "racist" and a "cheat," and implicated the president in potential criminal activity. Cohen is set to begin a three-year prison sentence after he pleaded guilty to bank fraud, tax fraud, campaign finance law violations and lying to Congress.

Trump has accused Cohen of lying to prosecutors to secure a lighter prison sentence.