President-elect Donald Trump will announce ExxonMobil CEO Rex Tillerson as his nominee for secretary of State on Tuesday, according to multiple reports.

Close Trump confidante and former House Speaker Newt Gingrich posted on Facebook Monday night about the CEO, appearing to hint at Tuesday's announcement.

“Rex Tillerson will be an extremely effective Secretary of State. He knows the world, he knows how to make deals internationally, and although it's hard for the Washington elites to comprehend that Donald J. Trump could nominate someone who is not a bureaucrat, Tillerson has exactly the right kind of determination and toughness we need to fix the State Department,” he wrote.

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Trump tweeted Monday night that he’d announce his pick to helm the State Department on Tuesday morning.

Tillerson met with Trump on Saturday at Trump Tower. Over the weekend, several media outlets, led by NBC News' Andrea Mitchell, reported that Tillerson will likely be the nation's next top diplomat.

Other State Department contenders included Sen. Bob Corker (R-Tenn.), former U.S. ambassador to the United Nations John Bolton and former CIA Director David Petraeus.

Former Massachusetts Gov. Mitt Romney confirmed Monday night that he would not be the secretary of State pick.

The 2012 GOP presidential nominee posted about the position Monday night on Facebook, saying, "It was an honor to have been considered for Secretary of State of our great country."