Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.), a Democratic presidential contender, compared President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's handling of his call with Ukrainian President Volodymyr Zelensky to Watergate, saying both instances pointed to a coverup.

"I just keep thinking about Watergate, because you had a president who was paranoid, who was facing an election, who wanted to get dirt on his political opponents," Klobuchar told host Greta Van Susteren in an interview that aired Sunday on "Full Court Press."

"Sounds exactly the same," she continued. "In Nixon's case, they did it with a crowbar, or whatever. They broke into the DNC headquarters and got the information out of a file cabinet. Well, this time you've got a president who's looking at all corners of the world to dig up dirt through foreign powers."

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"There's an argument it is even worse because he's messing around with national security. Then you had a cover-up with the Nixon administration, and you have the beginnings of a cover-up here where they're trying to hide the calls on this server. That's what this is about," she said.

House Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) announced earlier this month that House Democrats were launching an impeachment inquiry into Trump amid allegations raised by a whistleblower that he encouraged Ukraine's president to investigate into former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and then placed the transcripts of a call between the leaders on a highly classified server.

Attorney Andrew P. Bakaj confirmed on Sunday that his firm is representing a whistleblower related to a complaint about Trump's interactions with Ukraine.

Trump criticized the second whistleblower, claiming on Twitter that the individual is a member of the deep state and is working to undermine his presidency.