Former GOP Rep. David Jolly (Fla.) tore into congressional Republicans over their defenses 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 against Democrats’ impeachment investigation, saying they “look like fools.”

"What we’re seeing from House Republicans, frankly, is this childish behavior," he said on MSNBC on Saturday. "They’re displaying an arrogance, an anger, an immaturity — they look like fools."

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Republicans have railed against the House’s impeachment probe, with many saying the investigation is illegitimate since there has not yet been an official vote to start an inquiry.

However, they have also stayed relatively tight-lipped as to whether it was appropriate for Trump to ask Ukraine to investigate 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, a request that is at the heart of the probe.

"What Republicans should be doing ... and I struggle with even saying this because they’re on the wrong side of history and I hate to give them counsel that I think is accurate. Stop arguing about the process. Stop doing the sit-ins. Stop doing the stupid stuff that is not believable," Jolly said. "Frankly, the American people don’t care about the process."

“From [Sen.] Lindsey Graham Lindsey Olin GrahamLincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE’s [R-S.C.] stupidity to [Rep.] Matt Gaetz Matthew (Matt) GaetzTrump faces tricky choice on Supreme Court pick Florida attorney general scrutinizing Bloomberg paying fines for felons to vote Lara Trump campaigns with far-right activist candidate Laura Loomer in Florida MORE’s [R-Fla.] stupidity, get that to a concise argument,” he added, saying the focus should not be on the process but instead on some defense that says Trump’s behavior is unimpeachable.

Republicans, particularly those in the House, have been vocal in their defense of the president, with a group of GOP lawmakers recently storming a secure room to interrupt a closed-door deposition. However, some critics have cast the efforts as overly theatrical and potentially damaging.

"In short, they have compromised the security of the room," Rep. Eric Swalwell Eric Michael SwalwellHouse to vote on resolution affirming peaceful transition of power Swalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions MORE (D-Calif.) told reporters. "And they not only brought in their unauthorized devices; they may have brought in the Russian and Chinese with electronics in a secure space."