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 he 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 for secretary of State.

During an interview Sunday on CBS's "Face The Nation," Graham announced his plans to support Tillerson.

"In my office, he said that when America doesn't lead, other people will, and the vacuum is always filled by bad actors," Graham said, referring to Tillerson.

"He said that we have to have a foreign policy that engages the world, we need to lead from the front."

Graham, who challenged Trump in the GOP primary, said he's begging the new president to understand that "if we don't help others, over there, we're always going to be endangered here."

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He also announced his decision Sunday on Twitter.

"I will vote to confirm Rex Tillerson as Secretary of State," Graham tweeted.

After Tillerson's confirmation hearing, Graham said the Exxon Mobil CEO should have "knocked it out of the park."

“I think Tillerson is a very qualified guy, but I’d like to see more strength and clarity when it comes to Russia and the moral clarity that Marco was talking about,” Graham said after the hearing.

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.) also said Sunday he would vote in favor of Tillerson for secretary of State.