Rex Tillerson refused to resign after John Kelly asked -- so Trump fired him in a tweet: report
U.S. President Donald Trump and Secretary of State Rex Tillerson confer during a working lunch with African leaders during the U.N. General Assembly in New York, U.S. on September 20, 2017. REUTERS/Kevin Lamarque/File Photo

Former Secretary of State Rex Tillerson was fired by President Donald Trump on Monday after he refused a request to resign.

According to CNN, Tillerson officially learned of his firing on Tuesday morning when Trump informed the world in a tweet. But reports also said that Chief of Staff John Kelly had contacted Kelly on Friday to warn him.

Sources told AP's Zeke Miller that Kelly had asked Tillerson to resign, but the secretary of state refused and forced Trump to personally take the action on Monday.