5 things to know about new acting Attorney General Matthew Whitaker

President TrumpDonald John TrumpDemocrats blast Trump for commuting Roger Stone: 'The most corrupt president in history' Trump confirms 2018 US cyberattack on Russian troll farm Trump tweets his support for Goya Foods amid boycott MORE on Wednesday named Matthew Whitaker as acting attorney general after Jeff SessionsJefferson (Jeff) Beauregard Sessions Senate outlook slides for GOP Supreme Court blocks order that relaxed voting restrictions in Alabama Justice Dept. considering replacing outgoing US attorney in Brooklyn with Barr deputy: report MORE turned in his resignation from the top Justice Department role, marking a new era of oversight for the DOJ and special counsel Robert MuellerRobert (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’s investigation.

The president’s relationship with his top cop — and Whitaker’s now former boss — had deteriorated over the past two years following Sessions’ decision to recuse himself from the high-profile Russia probe. 

In his new capacity, Whitaker will take the reins of overseeing the probe from Deputy Attorney General Rod RosensteinRod RosensteinSupreme Court to hear dispute over Democrats' access to Mueller materials Republicans release newly declassified intelligence document on FBI source Steele GOP's Obama-era probes fuel Senate angst MORE, who has been a loyal defender of the investigation since Sessions stepped aside.

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Whitaker is now taking on a much more public role, after serving as Sessions' chief of staff. 

Here are five things to know about the new acting attorney general.

Whitaker criticized the Mueller probe

Before joining the Justice Department, Whitaker frequently criticized the very probe he will now be overseeing. 

Whitaker has accused the special counsel’s investigation of going "too far," while calling on Rosenstein to "limit the scope" of the investigation.

"The president is absolutely correct. Mueller has come up to a red line in the Russia 2016 election-meddling investigation that he is dangerously close to crossing," Whitaker wrote in an op-ed for CNN in August 2017.

Whitaker also previously wrote an op-ed in The Hill defending the president for firing former FBI Director James ComeyJames Brien ComeyTrump on possible Roger Stone pardon: 'His prayer may be answered' How conservative conspiracy theories are deepening America's political divide Bolton book sells 780,000 copies in first week, set to surpass 1M copies printed MORE, while blasting DOJ officials in the Obama administration for failing to examine scandals at the time when Barack ObamaBarack Hussein ObamaTrump confirms 2018 US cyberattack on Russian troll farm Democrats see convention as chance to underscore COVID-19 message Neil Young updates song 'Lookin' for a Leader' opposing Trump, endorsing Biden MORE was president.

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Whitaker, however, indicated in an interview with a local Des Moines, Iowa, news station that Trump should not fire Mueller. 

“I cannot imagine a scenario where Bob Mueller has done anything inappropriate, or that would demand his termination,” Whitaker said in June 2017.

And already, top Democrats in the House and the Senate have called on Whitaker to recuse himself for comments he’s made about Mueller, including Senate Minority Leader Chuck SchumerChuck SchumerDemocrats blast Trump for commuting Roger Stone: 'The most corrupt president in history' A renewed emphasis on research and development funding is needed from the government Data shows seven Senate Democrats have majority non-white staffs MORE (D-N.Y.) and House Minority Leader Nancy PelosiNancy PelosiThe Hill's Morning Report - Presented by Facebook - Justices rule Manhattan prosecutor, but not Congress, can have Trump tax records Supreme Court rulings reignite Trump oversight wars in Congress Pelosi on Baltimore's Columbus statue: 'If the community doesn't want the statue, the statue shouldn't be there' MORE (D-Calif.).

Democrats, who will regain control of the House in the next Congress, have already indicated that they plan to conduct oversight on a series of matters relating to the Trump administration — including his move to oust Sessions.

Whitaker believed there was a ‘strong’ case against Clinton

Whitaker has also expressed a series of opinions about Comey’s decision to not charge Hillary ClintonHillary Diane Rodham ClintonTrump confirms 2018 US cyberattack on Russian troll farm Hillicon Valley: Facebook considers political ad ban | Senators raise concerns over civil rights audit | Amazon reverses on telling workers to delete TikTok Biden campaign hires top cybersecurity officials to defend against threats MORE for her handling of classified materials during her time as secretary of State. 

At the time, Whitaker suggested the FBI was unfair in its treatment of Clinton.

“It’s clear that the FBI was looking for reasons not to bring criminal charges against Hillary Clinton,” Whitaker said in a September 2016 press release for the watchdog group Foundation for Accountability and Civic Trust (FACT), where he was the executive director at the time.

“The critical point the FBI overlooked is that Clinton clearly intended to send and store top secret, classified information on an unsecured, personal server, which I believe is a case that any reasonable prosecutor would bring against her or anyone else who committed such reckless acts,” he continued. 

Whitaker, who also expressed respect for Comey, disputed that the FBI chief had the authority to make such a decision instead of then-Attorney General Loretta Lynch. 

He, however, is not alone in these opinions -- many other Republicans have criticized Comey's decision not to charge Clinton.

House Republicans have been investigating the decision-making of top FBI and DOJ officials during the 2016 presidential race -- an investigation that may be coming to a close now that the House has flipped to Democratic control. 

Whitaker defended Donald Trump Jr.Don John TrumpSouth Dakota governor flew with Trump on Air Force One after being exposed to coronavirus: report Gianforte halts in-person campaigning after wife, running mate attend event with Guilfoyle Trump Jr. knocks CNN's Chris Cuomo over interview with father: 'I'm not pretending to be a journalist' MORE for taking the Trump Tower meeting

Whitaker defended the president’s eldest son for meeting with a Kremlin-linked lawyer who promised to give dirt on Clinton’s campaign amid the heated presidential race.

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Mueller is believed to be scrutinizing circumstances of the June 2016 Trump Tower meeting. Despite repeatedly changing the narrative of this meeting, Trump Jr. has denied receiving any incriminating information.

"You would always take that meeting,” Whitaker said during an appearance on CNN in July 2017 that recently re-surfaced.

“If you have somebody that you trust that is saying that you need to meet with this individual because they have information about your opponent, you would take that meeting,” he added.

Despite his defense, in a August 2017 op-ed in The Hill, Whitaker argued that the matter merits “serious investigation” as he pointed out another case of a Democratic official reportedly meeting with Ukrainian officials. 

Citing reports, Whitaker said news that a Democratic National Committee (DNC) official met with Ukrainian officials in an effort to investigate ties Trump and his former campaign manager Paul ManafortPaul John ManafortThe Hill's Morning Report - Presented by Facebook - Trump turns to immigration; primary day delays expected GOP votes to give Graham broad subpoena power in Obama-era probe Will the 'law and order' president pardon Roger Stone? MORE had to Russia merits investigation, but it is being "swept under the rug."

“Given what we know today about both situations, it’s clear they both merit serious investigation,” Whitaker wrote in the op-ed. “Foreign influence in our politics is nothing new but it is very concerning and should be investigated. The DNC/Ukraine connection is serious, and the public deserves answers.” 

His remarks echoed those of Trump at the time, who opined that the matter wasn't receiving its due attention.

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In another potential Mueller tie, Whitaker is friends with Sam Clovis

Sam Clovis, who previously served as the Trump campaign's co-chairman, tapped Whitaker to serve as his chairman during a bid to be Iowa’s state treasurer in 2014.

Whitaker, who was then a managing partner of Whitaker Hagenow & Gustoff LLP, a Des Moines-based law firm, praised Clovis at the time for being an experienced public servant, according to reports. 

“When the opportunity came for me to have my name placed on the ballot as the Republican nominee for Treasurer of State, Matt became the logical person to chair my campaign committee,” Clovis reportedly said in a statement at the time.

Clovis, however, has also become entangled in Mueller’s probe, prompting some critics to claim these ties create a conflict of interest for Whitaker to oversee the Mueller probe.

The Washington Post reported earlier this year that Clovis was the campaign official who encouraged George PapadopoulosGeorge Demetrios PapadopoulosNew FBI document confirms the Trump campaign was investigated without justification Republicans plow ahead with Russia origins probe AG Barr just signaled that things are about to get ugly for the Russia collusion team MORE to set up an “off the record” meeting with Russian officials.

Papadopoulos, who pleaded guilty to charges that he lied to federal investigators about his contacts with Russians during the campaign, has been sentenced to two weeks in prison. 

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Clovis, while acknowledging he remains friends with Whitaker, disputed that those ties impact Whitaker's ability to oversee the investigation.

“It’s not relevant and Matt has high integrity. I’m very happy for him and he’ll do a fantastic job,” Clovis told the Post on Wednesday.

Whitaker is considered a Trump loyalist

Trump is reportedly fond of Whitaker, a former football player who frequently went back and forth between the West Wing and the DOJ amid the president’s strained relations with Sessions.

“[Whitaker] has frequently visited the Oval Office and is said to have an easy chemistry with Mr. Trump,” The New York Times reported in September amid premature reports that Rosenstein had resigned.

Whitaker's name first appeared as a possible replacement after the Times published a bombshell report that said Rosenstein had spoken to other officials about wearing a wire to record Trump after he fired Comey last May. The story also said Rosenstein had discussed the possibility of Cabinet officials invoking the 25th Amendment to remove Trump from office last year. 

Rosenstein and the DOJ have fiercely disputed the Times report, claiming the comments were made in jest. Despite their denials, the report sparked nearly instant speculation that Rosenstein could be on his way out the door.

While questions about Rosenstein's fate bubbled up, Trump soon dispelled claims he would fire the No. 2 official.

Following that episode, however, Trump made sure to call and reassure Whitaker that he had faith in him, according to the Times.

In addition to his public defense of the president, Whitaker has also followed Sessions’ lead on having the agency align with the president’s key priorities, including immigration and violent crime, a current DOJ official told the Times in September.

While the president has said the appointment of Whitaker is temporary, it could be a test-run for other future roles in his administration.