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By Daniella Silva and Kristen Welker

Donald Trump will be naming his choice for secretary of state on Tuesday.

The president-elect turned to his favorite communication medium, saying in a post on Twitter Monday night that he would make the announcement in the morning.

Related: Rex Tillerson of ExxonMobil Expected to Be Named Trump's Secretary of State

Trump is expected to nominate ExxonMobil CEO Rex Tillerson as his secretary of state, sources close to the transition process told NBC News on Saturday and again on Monday.

The 64-year-old lifelong oil executive has no government or diplomatic experience, and critics have warned against his ties to Russian President Vladimir Putin.

Former Republican presidential nominee Mitt Romney was among the leading the names for the Cabinet position, despite scathing words Romney had for the president elect while he was on the campaign trail.

The unlikely pair had dinner together in November — Romney’s second meeting with Trump as part of his interview process for deciding who to name as secretary of state.

The meetings were a shift from Romney’s tone in the run up to the election, when he called Trump "a phony, a fraud."

But Trump called Romney on Monday telling him he had not be selected, sources close to the conversation told NBC News.

Romney also confirmed he would not be Trump’s choice in a post on Facebook Monday evening, saying "It was an honor to have been considered for Secretary of State of our great country."

"My discussions with President-elect Trump have been both enjoyable and enlightening," he said in the post. "I have very high hopes that the new administration will lead the nation to greater strength, prosperity and peace."

Other top contenders included Trump adviser and former New York City Mayor Rudy Giuliani and Sen. Bob Corker of Tennessee.

Giuliani removed his name from consideration on Nov. 29 for a position in Trump’s administration, Trump’s transition team announced Friday.