Sen. Richard Blumenthal (D-Conn.) said Paul Manafort is likely facing “serious criminal charges” in the investigation into possible ties between President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's campaign and Russia's efforts to influence the outcome of the election, according to The Washington Post.

Blumenthal said Manafort, Trump's former campaign manager, has been “resistant” to the probe and suggested that he is nervous about charges that he might be facing, according to the Post. Blumenthal added Manafort was more resistant than Donald Trump Jr.

“Manafort probably is confronting some fairly serious criminal charges,” Blumenthal said. “Manafort has been resistant, to be very blunt.”

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Manafort has already spoken with the Senate Intelligence Committee about the election, but the Senate Judiciary Committee has not been able to schedule him to testify, the Post reported.

Blumenthal added that the Judiciary Committee will not grant Manafort immunity in the probe.

Special counsel Robert Mueller has subpoenaed public relations firms that worked on a campaign run by Manafort.

FBI agents also raided Manafort’s home in July in connection with the Russia probe. Blumenthal said at the time that he believed there was “no question of clear evidence” of Manafort committing wrongdoing during the election.

"Apparently there is now no question of clear evidence connecting Paul Manafort to some criminal wrong doing," Blumenthal said in August.

Manafort was one of the members of the Trump team to attend a meeting with a Russian lawyer during the election that was also attended by Trump Jr. and Trump's son-in-law, White House senior adviser Jared Kushner.