(RNN) -President Donald Trump fired off a tweet on Friday announcing that John Kelly, the secretary of Homeland Security, has been named the new White House chief of staff.
The president followed with tweets thanking Reince Priebus, who has served in the position since Trump's inauguration. CNN reported that Priebus resigned on Thursday.
Priebus was head of the Republican National Committee and a top adviser to candidate Trump.
Priebus had an open feud with new White House Communications Director Anthony Scarmucci,and opposed his appointment to the position.
Scarmucci, in a profanity-laced comment to a reporter for the New Yorker indicated his contempt for Priebus and other top Trump advisers.
Trump appointed Kelly, a retired Marine general, to secretary of Homeland Security on Dec. 7, 2016 and he was confirmed on Jan., 20, 2017 the first day of Trump's administration.
He was the commander of the United States Southern Command from November 19, 2012, to Jan. 16, 2016.
He enlisted in the Marine Corps in 1970. He was promoted to brigadier general during the Iraq War. The Senate confirmed him as major general in 2007.