Rep. Eric Swalwell Eric Michael SwalwellSwalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions Swalwell: Barr has taken Michael Cohen's job as Trump's fixer MORE (D-Calif.) took aim at President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Thursday over reports that his presidential transition team is under investigation by federal prosecutors.

In an interview with CNN, the House Judiciary Committee Democrat remarked that an investigation into whether members of Trump's team took inaugural donations in exchange for favors broke the president's promise to "drain the swamp" of corruption in Washington D.C.

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"It shouldn't happen, and it breaks one of the fundamental promises Donald Trump made during the campaign, that he was going to 'drain the swamp,' and breaking that promise on day one," the California congressman said.

Swalwell added that the investigation into inauguration spending, first reported by The Wall Street Journal, indicated that Trump's presidency was fraught with illegal activity from the beginning.

“The bigger picture here is that you are now seeing more evidence than ever that Donald Trump was associated with a criminal campaign, a criminal transition, and presides today very likely over a criminal presidency,” Swalwell told CNN's Anderson Cooper.

“And you’ve seen people in his orbit who are either under investigation, have plead guilty or are serving prison time because of their association with one or all three of those different entities," Swalwell added.

Swalwell, 38, has seen his star rise in the Democratic Party and has told reporters in recent weeks that he is considering a 2020 run for president against Trump.

“I actually do see a path, I am considering it,” Swalwell told MSNBC's "Morning Joe" earlier this month. “Iowa’s first in the nation. I’ll be in New Hampshire this Friday and those states play an important role and I want to continue to listen and learn from those folks and make a decision just after the holidays."