A GOP congressman assailed Democrats in Congress for not condemning anti-Trump celebrities, name-checking Madonna and Robert De Niro during the president's impeachment hearing on Wednesday.

"I've heard President TrumpDonald TrumpRealClearPolitics reporter says Freedom Caucus shows how much GOP changed under Trump Jake Ellzey defeats Trump-backed candidate in Texas House runoff DOJ declines to back Mo Brooks's defense against Swalwell's Capitol riot lawsuit MORE radicalized the rioters that stormed this Capitol," Rep. Ken BuckKenneth (Ken) Robert BuckHillicon Valley: Biden: Social media platforms 'killing people' | Tech executives increased political donations amid lobbying push | Top House antitrust Republican forms 'Freedom from Big Tech Caucus' Top House antitrust Republican forms 'Freedom from Big Tech Caucus' Bipartisan group calls on Biden to clarify reasoning for Syria airstrikes MORE (R-Colo.) said while the House debated an impeachment article over the president's role in inciting his supporters to attack the Capitol last week.

"And I would say we need to look no further than ourselves to find out what happened and to look at history," Buck continued.

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"Americans were frustrated when they learned the FBI was investigating the Trump campaign," he said, before naming several high-profile celebrities critical of the commander in chief.

"And then, the socialists in Hollywood joined their allies in Congress. Robert De Niro said that he wanted to punch the president in the face," Buck said.

"Madonna thought about blowing up the White House. Kathy Griffin held up a likeness of the president's beheaded head."

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Madonna defended those remarks at the 2017 Women's March on Washington, saying days after the event that she was "not a violent person."

In 2017, comedian Griffin drew intense backlash and faced canceled tour dates after posing for a photo shoot with a prop meant to look like Trump's severed head.

"And nothing was said by my colleagues at that point in time," Buck said Wednesday. "In fact, one Democrat colleague said that Trump supporters should be harassed wherever they are," he added, noting incidents involving former White House press secretary Sarah HuckabeeSarah SandersTrump expected to resume rallies in June Andrew Giuliani planning run for New York governor Trump appears at Sarah Huckabee Sanders campaign event MORE Sanders and former Department of Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenEx-Trump official: 'No. 1 national security threat I've ever seen' is GOP Left-leaning group to track which companies hire former top Trump aides Rosenstein: Zero tolerance immigration policy 'never should have been proposed or implemented' MORE.