Former CIA chief John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE said Republican senators are "running scared" of 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 as the impeachment inquiry intensifies.

On "Meet the Press," Brennan called out Chuck Todd Charles (Chuck) David ToddMurkowski: Supreme Court nominee should not be taken up before election Republican senator says plans to confirm justice before election 'completely consistent with the precedent' Sunday shows - Trump team defends coronavirus response MORE's previous guest, Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' The Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination MORE (R-Wis.), who Todd accused of not answering his questions to "make Donald Trump feel better here that you're not criticizing him."

"Clearly Sen. Johnson is running scared of Donald Trump as are the other Republican senators because if they say anything against him, he comes after them with a vengeance," Brennan said.

Brennan said the president has transformed into the "typical bully" and said that "it's clear that the Republicans in the Senate are just going along."

"I've had many issues with the Democrats over the years," Brennan told Todd. "But I have never seen anything like the Republicans right now, as far as just misrepresentations of the truth because of what Donald Trump has done."

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The former CIA chief said disinformation is "overwhelming and inundating the airwaves," confusing American citizens as the inquiry continues.

"Until the senior officials of the Republican Party push back against Trump, I think this is going to be a very, very long and difficult fight," Brennan said.

Most Republicans have stood by the president as the impeachment inquiry has unfolded, saying there was no quid pro quo in Trump's phone call with Ukrainian President Volodymyr Zelensky.

The House initiated the inquiry following reports of the president's conversations with Zelensky about investigating 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, Trump's potential 2020 opponent. Days before the call, the president withheld aid to the country, prompting questions of whether the conversation implied a quid pro quo.