A Republican group is urging GOP members of Congress to take seriously allegations of obstruction of justice made against President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE in a new ad released Monday.

Republicans for the Rule of Law is airing the ad on "Fox & Friends" on Monday, ahead of the House Judiciary Committee’s hearing with Watergate star witness and former Nixon White House counsel John Dean to discuss the evidence of potential obstruction uncovered by special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE.

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In the 60-second ad, first shared with The Hill, Republican members of the House Judiciary Committee during the Watergate hearings are shown raising concerns about potential obstruction of justice as committed by then-President Nixon.

“When Nixon was alleged to have obstructed justice, Republicans on the House Judiciary Committee took these allegations seriously,” the ad begins.

Footage of several GOP lawmakers serving on the panel at that time is then shown, as they called for action to be taken over the then-president’s obstruction efforts.

“It is we, not the Democrats, who must show we are capable of enforcing the high standard we would set for them,” Rep. M. Caldwell Butler (R-Va.) is shown saying.

“Republicans stood for the rule of law then. Republicans should stand for the rule of law now,” the ad ends.

Chris Truax, a spokesperson for Republicans for the Rule Law, called the group’s new ad a “reminder of what patriotism and political bravery can look like.”

“Congressional Republicans are more than happy to admit in private that they are troubled, disappointed, and disturbed by President Trump’s abuses of executive power,” Truax said.

“When none of their constituents can hear them, they speak frankly about their moral qualms and objections about their roles in undermining the original design of our Constitution. Their constituents — and all Americans — deserve to hear the same in public.”

Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (R-Mich.) is the only Republican currently serving in Congress who has come out in favor of starting impeachment proceedings against Trump, based off the obstruction findings in the Mueller report.

He has said that other Republicans have privately raised concerns to him about Trump’s conduct.

Republicans for the Rule of Law has aired similar ads in the past. One such video showed three former federal prosecutors, all appointed by Republicans, who argue that Trump would have been indicted on obstruction charges were he not the president.

Mueller declined to say in his report whether he believed Trump had committed a crime.

And he said at a press conference late last month that charging Trump with a crime “was not an option we could consider,” pointing to Justice Department guidance that states a sitting president cannot be indicted.

Trump and his allies have declared that the president's name should be cleared over the allegations, as Attorney General William Barr Bill BarrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs YouTube to battle mail-in voting misinformation with info panel on videos MORE said that he and then-Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE determined there wasn’t enough evidence to charge the president.

But some Democrats argue that Mueller signaled that they should start impeachment proceedings against Trump. Fifty-six Democratic lawmakers have called for an impeachment inquiry so far, according to a list compiled by The Hill.

Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) has staved off those calls, pointing to recent court victories by Democrats in their investigations of the president as showing there are other means of holding Trump accountable.

But lawmakers aren't planning on letting the Mueller report stay out of the spotlight: Democrats on the House Judiciary Committee are planning a series of hearings to examine the special counsel's findings, starting with Monday’s hearing with Dean.