Pelosi said Schiff's GOP critics are launching desperate attacks to distract from the facts surrounding Trump's dealings with Russian figures both during and since the 2016 campaign — an issue Schiff and committee Democrats continue to investigate.

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"What is the president afraid of? Is he afraid of the truth, that he would go after ... a respected chairman of a committee in the Congress? I think they're just scaredy cats; they just don't know what to do. So they have to make an attack," Pelosi said during a press briefing in the Capitol.

"It's their own insecurity, their own fear of the truth, their fear of the facts, and their fear of an effective patriotic leader, in his measured way, who's going to make sure the American people know the truth," she added.

Throughout the Mueller investigation, Schiff was a frequent guest on cable news programs, where he asserted there was already enough evidence to conclude that Trump had "colluded" with Moscow to help his presidential victory — a message he reiterated this week.

“There was a big difference between whether there was evidence of collusion — and I think that evidence is in plain sight — and whether you can establish proof beyond a reasonable doubt of a criminal conspiracy,” he told CNN on Monday.

All nine Republican members of the Intelligence Committee delivered a letter to Schiff on Thursday urging him to relinquish his gavel.

Trump, hours earlier, had called on Schiff to resign from Congress.

"Congressman Adam Schiff, who spent two years knowingly and unlawfully lying and leaking, should be forced to resign from Congress!" Trump tweeted

A defiant Schiff confronted his critics head on Thursday, accusing Republicans of whitewashing well-established contacts between Russian figures and Trump's campaign during the campaign, including a June 2016 meeting in Trump Tower with the president's eldest son.

Almost two years ago, Nunes had publicly recused himself from the investigation into Russia's election meddling after the Ethics Committee opened its own probe into whether he had disclosed classified information. Pelosi on Thursday said the recusal was a charade, suggesting Nunes was working behind the scenes to protect his White House ally all along.

"He should have recused himself. He gave you the impression that he recused himself, but he never did," she said. "He acted in a very bad way."