A Republican group defended special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE against attacks by President TrumpDonald John TrumpOver 100 lawmakers consistently voted against chemical safeguards: study CNN's Anderson Cooper unloads on Trump Jr. for spreading 'idiotic' conspiracy theories about him Cohn: Jamie Dimon would be 'phenomenal' president MORE in an ad that aired Wednesday morning during “Fox & Friends” — a show that Trump is said to frequently watch.

The 30-second ad from Republicans for the Rule of Law highlights Mueller’s military service in Vietnam and his service as head of the FBI during the Bush administration.

“Mueller has been trusted by Republicans to put America first,” the ad says.

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It also shows congressional leaders Sen. Mitch McConnellAddison (Mitch) Mitchell McConnellMurkowski echoes calls for Kavanaugh, accuser to testify McConnell rips Democrats for handling of Kavanaugh nomination Kavanaugh furor intensifies as calls for new testimony grow MORE (R-Ky.) and House Speaker Paul RyanPaul Davis RyanPelosi calls on Ryan to bring long-term Violence Against Women Act to floor Juan Williams: America warms up to socialism Jordan hits campaign trail amid bid for Speaker MORE (R-Wis.) supporting the probe into Russian interference in the 2016 presidential election.

“I have a lot of confidence in Bob Mueller,” McConnell says in the ad.

McConnell has said he believes Mueller should not be fired but said Tuesday he doesn’t think the Senate needs to pass legislation to protect the special counsel.

The ad also shows Vice President Pence saying “the special counsel has a job to do.”

It urges viewers to call their representatives and demand they protect the Mueller investigation.

Republicans for Rule of Law was founded by conservative commentator Bill Kristol and GOP members who don’t want to see Mueller fired during his Russia investigation.

Kristol tweeted about the ad on Monday night, taking a dig at Trump’s television habits by airing the spot during the Fox News show the president reportedly watches.

“You (and President Trump) can see our first TV ad--defending the Mueller investigation--on Fox and Friends in DC tomorrow morning.”

Reports broke on Tuesday that Trump had tried to fire Mueller in December after inaccurate claims that Mueller subpoenaed Deutsche Bank for Trump’s finances.

The White House said Tuesday that Trump “certainly believes” he has the power to fire Mueller after the FBI raided the office and home of his personal attorney, Michael Cohen.

However, legal experts say the authority falls on the Department of Justice official in charge of the probe, Deputy Attorney General Rod RosensteinRod Jay RosensteinThe Hill's Morning Report — Sponsored by United Against Nuclear Iran — Kavanaugh confirmation in sudden turmoil Lisa Page bombshell: FBI couldn’t prove Trump-Russia collusion before Mueller appointment Ken Starr: 'Hell to pay' if Trump tries to fire Mueller MORE.

Trump is reportedly mulling firing Rosenstein over the raid since the deputy attorney general personally signed off on the paperwork approving it.

Republicans and Democrats have united in their support of Mueller and urged the president not to fire Rosenstein.

Sen. Charles SchumerCharles (Chuck) Ellis SchumerDemocrats should end their hypocrisy when it comes to Kavanaugh and the judiciary Celebrities back both Cuomo and Nixon as New Yorkers head to primary vote Dems launch million digital ad buy in top Senate races MORE (D-N.Y.) said Tuesday afternoon that Trump firing Rosenstein would spark a "constitutional crisis."