Sen. John McCain John Sidney McCainThe electoral reality that the media ignores Kelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks MORE (R-Ariz.) will vote in favor of Rex Tillerson, President Donald 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’s nominee to head the State Department.

McCain told ABC’s “This Week” in an interview that aired Sunday that he would support Tillerson’s nomination.

“I will be voting in favor of his nomination. I have had numerous conversations with him. And, again, my concerns have been about our relations with Russia,” McCain said in the interview.

McCain added that his decision to vote for Tillerson “was not an easy call."

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“But I also believe that, when there's doubt, the president, the incoming president, gets the benefit of the doubt,” McCain said.

“And that's the way I have treated every president that I have had the obligation to vote for or against as a member of the United States Senate.”

McCain, a critic of Russian President Vladimir Putin, said last month that the former Exxon Mobil CEO's relations with Russia were “a matter of concern.”

“I don’t know what Mr. Tillerson’s relationship with Vladimir Putin was, but I’ll tell you it is a matter of concern to me,” he said in a December interview.