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.) jokingly told a crowd Monday evening that President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE mentioned 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 “about 20 times” while they played golf over the weekend.

Graham said he urged the president not to preemptively end the special counsel investigation into Russia's 2016 election meddling for fear that it could hurt Republicans chances in the midterm elections.

“I want to win in November. If we stop the Mueller probe tomorrow, you wouldn’t be able to talk about anything else,” Graham said, as first reported by Roll Call. “I told the president this: I promise you, you’ll be treated fairly. I promise you that the people who put the [Hillary] Clinton investigation in the tank, they’re going to have their day, too.”

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While Graham said he agrees with the president that there is no evidence his campaign team colluded with Russia, he has said before he does not share Trump’s opinion that the Mueller investigation is a witch hunt.

“He is following the evidence where it takes him, and I think it’s very important that he be allowed to do his job without interference, and there are many Republicans who share my view,” Graham told CNN’s Jake Tapper in March.

The comments come amid increased scrutiny of a 2016 meeting in Trump Tower between Trump campaign officials — including the president’s son, Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, son-in-law Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE and campaign manager Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE — and a Russian lawyer with Kremlin ties.

While Trump and his campaign initially claimed the meeting was to discuss adoption policies between the U.S. and Russia, the president finally admitted Sunday it was to gain information on Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE, Trump's 2016 opponent.

“Fake News reporting, a complete fabrication, that I am concerned about the meeting my wonderful son, Donald, had in Trump Tower. This was a meeting to get information on an opponent, totally legal and done all the time in politics - and it went nowhere. I did not know about it!” he said.

Graham said this week that, given Senate rules, "there's a good chance" he'll be chairman of the Judiciary Committee in the next Congress, and, if he is, Trump can expect further investigation into the FBI's handling of its 2016 probe into Clinton's private email server, as well as the surveillance warrant that Trump defenders say served at the basis of the Russia probe.

“So, I’m going to let Mueller do his job and we’ll see what he finds, but Mueller’s not in charge of looking at the [Foreign Intelligence Surveillance Act] FISA warrant application, he’s not in charge of overseeing the FBI. What they did during the 2016 election on behalf of Clinton appalls me," he said.