GOP group defends Mueller ahead of testimony

A Republican group defended former special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay 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 HannitySean Patrick HannityHypocrisy is the currency of the realm for GOP in the age of Trump GOP threatens to weaponize impeachment witnesses amid standoff Trump wants To 'deescalate,' but will his supporters let him? 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 GrahamLindsey Olin GrahamSenator-jurors who may not be impartial? Remove them for cause Broad, bipartisan rebuke for proposal to pull troops from Africa What to watch for as Senate organizes impeachment on day one MORE (R-S.C.) and Attorney General William BarrWilliam Pelham BarrThe Hill's Morning Report - Trump trial begins with clashes, concessions Barr wrote 2018 memo contradicting Trump's claim that abuse of power is not impeachable Brent Budowsky: McConnell, Roberts and Trump on trial 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!”