California Rep. Ted Lieu (D) said Thursday that a decision by President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE to pardon his former campaign chairman, Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, would be grounds for impeachment, as Manafort faces a jury's impending verdict in his ongoing trial.

But he added that he didn't think Republicans would punish such a move.

"I believe pardoning Paul Manafort would be grounds for impeachment," Lieu told CNN. "Whether Republicans would act on that, I don’t think they would."

"[That] is why this November the voters across America have a chance to change the makeup of Congress and put a real check and balance by putting in Democrats to control," he added.

Rep. Lieu: If the President pardoned Paul Manafort it “would be grounds for impeachment....” I don’t think Republicans would act on that which is why this November “voters across America have a chance to change the makeup of Congress” https://t.co/ar88ZglVQS pic.twitter.com/prTRoewni5 — The Situation Room (@CNNSitRoom) August 16, 2018

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Trump said in June that it was "too early" to consider pardons for any of his former aides ensnared by the special counsel investigation, but said a month later that everyone agrees that the president has the "complete" power to pardon any U.S. citizen.

When pressed by CNN's Jim Acosta on whether Democrats in Congress could take any actions before the midterms if a hypothetical pardon were issued, Lieu deflected and said that 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 special counsel investigation could decide to take action if they believed a pardon was issued with the intent to dissuade Manafort from cooperating with Mueller's investigation.

Nearly 60 House Democrats voted to introduce articles of impeachment against the president last December, an issue that has however failed to gain traction among Democratic leadership so far.

Manafort's fate in his Virginia trial for a slew of charges unrelated to alleged Russian collusion with Trump's campaign now rests with the jury, after the defense rested without calling any witnesses on Monday.

He is charged with bank fraud and money laundering related to alleged efforts to hide millions made in Ukraine in a number of foreign bank accounts, which prosecutors said he used to fund a lavish lifestyle in the United States.

Manafort's tenure with the Trump campaign ended before the 2016 presidential election over controversy surrounding his lobbying work.