A Republican group defended former 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 ahead of his congressional testimony in a new ad released Monday.

Republicans for the Rule of Law is airing the ad on Sinclair stations and Sean Hannity Sean Patrick HannityFormer Florida attorney general calls Kyle Rittenhouse 'a little boy out there trying to protect his community' Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Cruz: Trump should nominate a Supreme Court justice next week MORE's Fox News show Tuesday, a day ahead of Mueller's scheduled testimony in front of the House Judiciary and Intelligence committees.

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The ad touts the former FBI chief's credentials and career targeting corruption, and includes clips of Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) and 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 praising him.

The former special counsel's investigation into Russian interference in the 2016 election did not find sufficient evidence to bring charges against Trump or his campaign over allegations they conspired with Moscow.

Mueller declined to clear the president of obstruction of justice, outlining 10 “episodes” of possibly obstructive behavior, but saying existing Department of Justice guidelines against indicting a sitting president prevented him from bringing charges.

Mueller has said he will not discuss anything outside the purview of his report during the hearings, but Democrats believe getting Mueller to outline the findings in person will strengthen and affirm their arguments about Trump's misconduct.

The president has gone on the offensive against Mueller ahead of the testimony.

In a pair of tweets Monday, Trump repeated his claim that Mueller is “highly conflicted” and accused him of leading a “ridiculous Witch Hunt.”

He also repeated his belief that Mueller’s report found “NO COLLUSION, NO OBSTRUCTION!”