He is a Great American", Trump wrote, "and a Great Leader.
Scaramucci promptly fired one RNC holdover on the communications staff, and immediately set about bad-mouthing Priebus on television and describing him as a "paranoid schizophrenic" to a reporter for the New Yorker.
The President broke the news on Twitter when the plane landed, welcoming incoming chief of staff Homeland Security Secretary John F. Kelly.
US Secretary of Homeland Security John Kelly testifying during a Senate Homeland Security and Governmental Affairs Committee hearing on Capitol Hill in Washington, DC.
Trump had lost confidence in Priebus, privately questioning his competence after major legislative items have failed to pass congress, someone close to Trump told Reuters news agency.
The embattled former chief of staff had faced pressure since being named as a possible leaker by Mr Trump's newly appointed director of communication.
Trump also thanked Priebus for his service.
Mr Kelly is now the secretary of homeland security and Mr Trump tweeted that he "has been a true star of my administration".
Oil rises on promise from Saudis to limit exports next month
The committee did not back capping Libyan output as it said its production was unlikely to exceed 1 million bpd in the near. Nigeria's oil minister said earlier this year Abuja is targeting 1.8 million bpd before it considers joining the cut.
Before taking over as secretary of homeland security, Kelly, 67, served in the top slot of the U.S. Southern Command, the Pentagon's area of responsibility focused on the Caribbean and South America, and notably Guantanamo Bay, Cuba. When I said we were brothers from the podium, that's because we're rough on each other. And it felt like Priebus blocked him from that, Priebus and to a lesser degree Steve Bannon. I could not be more proud to call Reince a dear friend.
Both Scaramucci and Priebus traveled to New York's Long Island with Trump on Friday for an event where the president highlighted efforts to crack down on the gang MS-13.
Kelly, meanwhile, said he is "honored to be asked to serve as the chief of staff" to the president.
Kelly takes on the key White House role after six months in the top spot at Homeland Security, a department that was created in the aftermath of the September 11, 2001, terrorist attacks on NY and Washington, D.C. The Senate voted in January to confirm Kelly by an 88 to 11 vote. In a tweet that he later deleted, Scaramucci threatened Priebus to report Federal Bureau of Investigation and the justice department about the felony and would not rest until justice is served. And I think he's right. He insists that many in the administration don't care about Trump's agenda, but are simply there because they wanted fame and media attention. The House moved this week to allocate $1.6 billion for 70 miles of Trump's border wall, amid input from border security officials about how much wall is needed and where alternate methods of enforcement would be a better investment.
On Thursday, Ryan had praised Priebus for doing "a fantastic job" as White House chief of staff. Scaramucci, despite this week (or - gulp - maybe because of it) is weirdly ascendant in the White House.
But, Trump can't go any higher than fifth on this list. Why?
White House spokeswoman Sarah Sanders said she did not think the administration's relationship with the Republican Party would be affected by Mr Priebus's exit. I know you will do a great job! He is expected to start his new job Monday.
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