Sen. Lindsey Graham Lindsey Olin GrahamThe Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Senate Democrats' campaign arm announces seven-figure investment to boost Graham challenger Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation MORE (R-S.C.) said Sunday that he intends to ask FBI Director Christopher Wray whether the bureau opened a counterintelligence investigation regarding the possibility that President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE was a Russian agent.

The senator, who serves as the chairman of the Senate Judiciary Committee, called a New York Times report that the FBI launched an inquiry into whether Trump was working for Russia after the president fired former bureau chief James Comey James Brien ComeyTrump jabs at FBI director over testimony on Russia, antifa Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' MORE "astonishing," but cast skepticism on its findings.

"I, for one, don’t trust what I read in The New York Times," he said on "Fox News Sunday," arguing the source of the story may have an agenda.

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"Having said all that, I‘m going to ask the FBI director was there a counterintelligence investigation opened up regarding the president as being a potential agent of the Russians," Graham continued. "I find it astonishing, and to me it tells me a lot about the people running the FBI, [former Deputy Director Andrew] McCabe and that crowd."

"So if this really did happen, Congress needs to know about it," he continued. "And what I want to do is make sure how could the FBI do that? What kind of checks and balances are there?"

According to the Times, Comey's firing caused such concern among law enforcement that officials began probing if Trump was a threat to national security or secretly carrying out anti-American agendas on behalf of Russian officials.

In an interview with NBC in 2017, Trump cited the investigation into Russian interference in the 2016 election as part of his reasoning for firing Comey. He has since offered conflicting explanations for the decision.

The president responded to The New York Times report by lashing out at Comey and the special counsel's investigation into Russian interference.

Asked on Fox News on Saturday night whether he is or has ever worked for Russia, Trump called it "the most insulting thing" he's ever been asked, but did not directly answer.