Sen. Richard Blumenthal (D-Conn.) said Tuesday that there is a “credible case” of obstruction of justice that can be made against 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.

Blumenthal, who sits on the Senate Judiciary Committee, said on CNN that Trump’s tweet acknowledging that he knew former national security adviser Michael Flynn had lied to the FBI also showed that Trump knew the information when he fired officials like former FBI Director James Comey and former acting Attorney General Sally Yates.

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“There is mounting available … evidence that in fact Donald Trump should be investigated for obstruction of justice and that there is a credible case against him,” Blumenthal said.

Blumenthal’s comments come just days after Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (D-Calif.) said the Judiciary Committee’s investigation into Russia's election interference included obstruction of justice.

"The Judiciary Committee has an investigation going as well and it involves obstruction of justice and I think what we're beginning to see is the putting together of a case of obstruction of justice," Feinstein said Sunday.

Trump suggested in a tweet on Sunday that he knew Flynn had lied to the FBI when he fired the national security adviser. The president's personal lawyer, John Dowd, later said that he drafted the tweet, saying it was his "mistake."

I had to fire General Flynn because he lied to the Vice President and the FBI. He has pled guilty to those lies. It is a shame because his actions during the transition were lawful. There was nothing to hide! — Donald J. Trump (@realDonaldTrump) December 2, 2017

Flynn pleaded guilty to lying to the FBI last week and is now cooperating with special counsel Robert Mueller's probe.