Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE’s (R-S.C.) expected election as chairman of the Senate Judiciary Committee would put one of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s closest allies in charge of a panel overseeing the confirmation of judges and 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’s probe.

Republican sources say they expect Graham to be more of a partisan player than Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa), whose decision to step down as Judiciary Committee chairman to take the gavel of the Finance Committee paves the way for the South Carolina Republican to take over.

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He’s seen as a fighter who will take on Democrats: Witness his forceful denunciation of their tactics during the Brett Kavanaugh Brett Michael KavanaughHarris faces pivotal moment with Supreme Court battle Poll: 59 percent think president elected in November should name next Supreme Court justice Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight MORE Supreme Court hearings, which went viral online.

Yet Graham also is seen as a ready dealmaker when it comes to passing legislation.

“I think Graham will be bit more partisan but also somebody who the Democrats are more likely to cut a deal with,” said Brian Darling, a GOP strategist and former Senate aide.

Graham has been outspoken in arguing that Trump won’t fire Mueller — a possibility that Democrats say can’t be ruled out — yet he is also a co-author of legislation protecting the special counsel that Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) doesn’t want to put on the floor.

Graham is also a co-author of a bipartisan deal on criminal justice reform, which Trump supports but McConnell and conservatives such as Sen. Tom Cotton Tom Bryant CottonGOP brushes back charges of hypocrisy in Supreme Court fight Trump uses bin Laden raid to attack Biden Battle lines drawn on precedent in Supreme Court fight MORE (R-Ark.) oppose.

“He’s someone who will fight the partisan fights when it comes to the Mueller investigation and when it comes to using the committee to subpoena individuals and do oversight,” Darling said.

“He’ll be very defensive of the president when it comes to those issues,” Darling added. “But on substantive legislative issues, he’s going to be much more likely to cut a deal with Democrats where the president can sign onto it.”

Graham says his top priority will be to confirm conservative justices to the federal courts, which is also the top priority for McConnell.

Though Graham must be formally elected as chairman of Judiciary by his fellow Republicans on the panel, GOP sources say his ascension is guaranteed.

“If I am fortunate enough to be selected by my colleagues to serve as Chairman, I will push for the appointment and Senate confirmation of highly qualified conservative judges to the federal bench and aggressive oversight of the Department of Justice and FBI,” he said in a statement Friday.

More specifically, Graham says he will scrutinize the FBI’s handling of the Russia investigation, something that Trump has called for in recent months.

“The oversight function would be very much front and center,” he told reporters this week when asked whether as chairman he would look into the Russia investigation and how it was handled.

Graham publicly clashed with Trump during the 2016 Republican presidential primary, but has since become one of the president’s golfing partners and closest confidants in the Senate.

He spoke with Trump about the Mueller investigation Wednesday and then met Thursday with Matthew Whitaker, who is overseeing the probe as acting attorney general.

He told reporters after the meeting that Mueller isn’t in any danger of being fired, something that GOP leaders have said to fend off calls for Congress to pass legislation protecting the special counsel.

Graham, who represents one of the most conservative states in the country, has had an up-and-down relationship with conservatives over the years.

He was Sen. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE’s (R-Ariz.) best friend for many years on Capitol Hill and a key ally in his fight to pass comprehensive immigration reform, which was unpopular with conservatives.

He even worked closely with former Sen. John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE (D-Mass.) in 2009 on cap-and-trade climate change legislation, another proposal conservatives opposed, although he later changed course and declared cap-and-trade legislation dead in 2010.

On Thursday, he said he will look into campaign finance reform — one of McCain’s signature issues — if he takes over the Judiciary panel.

“I would like to have a hearing about dark money, how foreign governments, even terrorist organizations, can create shell companies, corporations in America [and] actually influence an election,” he said.

Graham said he doesn’t agree with the Supreme Court’s 2010 decision in Citizens United v. Federal Election Commission, which dramatically curbed Congress’s ability to restrict political spending by outside groups.

“I don’t like the decision. I think we have ample authority as legislative bodies to control how campaigns are run,” he said.

Graham won points with conservative activists during Kavanaugh’s confirmation hearing.

“This is the most unethical sham since I’ve been in politics,” Graham yelled at his Democratic colleagues on the panel, pointing to Sen. Dianne Feinstein Dianne Emiel FeinsteinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Democrats shoot down talk of expanding Supreme Court Biden leads Trump by 12 points among Catholic voters: poll MORE’s (D-Calif.) decision to sit on sexual assault allegations against Kavanaugh for more than a month.

It was sharp contrast with Grassley, who grew visibly frustrated with Democrats at times but never rebuked them as strongly as Graham.

“The fact that somebody was on the committee very angrily pushing back on Democrats I think the conservatives really liked it,” said Darling. “The conservative movement has had a very interesting and difficult relationship with Lindsey Graham over the years. There have been times where he’s been a conservative, there have been times when he’s been more liberal.”

Graham has long argued that presidents should be given broad deference in appointing judges to the federal courts.

He voted for former President Obama’s two picks to the Supreme Court, Sonia Sotomayor and Elena Kagan.

Several Senate colleagues see Graham’s increasingly close relationship with Trump — and his angry outburst in defense of Kavanaugh — as part of an effort to shore up his base ahead of his 2020 reelection.

Graham was considered vulnerable to a Tea Party challenge in 2014 after prominently pushing comprehensive immigration reform the year before, but he won the primary with 56 percent of the vote against divided opposition.

One Republican source said there’s a chance that Graham could follow up on the Kavanaugh debate by punishing Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), a member of the panel, for making public “committee-confidential” documents during the nominee’s first round of hearings.

“I think that he is probably considering kicking Booker off the committee because of the committee confidentiality they broke. I haven’t spoken to him but I know how outraged he was,” said a person who has been involved in the Senate’s judicial confirmation process for more than 20 years.

The source noted that Sen. Patrick Leahy Patrick Joseph LeahyDemocrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (D-Vt.) was pressured to resign from the Senate Intelligence Committee in 1987 after he leaked a draft report of the panel’s investigation into the Iran-Contra scandal.