It was an unusual move coming from Trump, who has largely resisted being told what to do and frequently favors those who allow him to act on his impulses.
Kelly then demanded that other advisers leave the room so he could speak to the president frankly.
Mr Kelly, known for his no-nonsense approach, could help bring some normality and stability to the Trump ship after a rocky start and stumbles in Congress, Mr Kraushaar said.
It was an early indication that Kelly, a decorated retired Marine general who served three tours in Iraq, is not afraid to stand up to his commander-in-chief.
President Donald Trump's new chief of staff is entering a West Wing battered by crisis.
Kelly would ultimately accept the role as secretary of Homeland Security. He has put in place a team - from Kelly to Scaramucci and on down - that is much more likely to affirm and amplify his gut instincts to "let Trump be Trump" than to block them.
Trump's decision to tap Kelly as his new chief of staff was hailed by Republicans who had long called for order in a chaotic White House.
"If he disagrees with you, he'll disagree respectfully", Rethmeier said.
"I have never had a problem speaking truth to power, and I firmly believe that those in power deserve full candor and my honest assessment and recommendations".
North Korea Sanctions: China Urges Dialogue With Pyongyang
North Korea has repeatedly said it will never give up its nuclear arsenal, which it sees as a guarantee of its security. Security Council approved for North Korea , saying they will have a "very big financial impact".
"He's a guy who wants to do the job as best he can, and the last thing he wants to have to deal with is the political sniping that I'm sure is going on", Panetta said in an interview.
The statement revived the "clean slate" language that former White House press secretary Sean Spicer had used to describe his own reason for resigning on the day Trump brought Scaramucci aboard.
Kelly's appointment to chief of staff even prompted a tweet Friday from Walter Isaacson, the outgoing president of the Aspen Institute, which hosted the Security Forum: "Unlike some other officials, in Aspen John Kelly avoided partisan shots, paid respect to Jeh Johnson, John Brennan".
Hours after Trump said deportations of people in the USA illegally were being carried out as a "military operation", Kelly said the US would not enlist the military to enforce immigration laws.
Kelly himself is aware he can't completely control Trump's habits. Both moved swiftly to address gaps in the measure, with Mattis asking that Iraqis who helped US troops be exempt and Kelly clarifying that green-card holders would not be affected. Trump is a real person, and Americans see that every time he tweets.
He said he likes having the first daughter and her husband Jared Kushner in the White House, despite the turmoil Kushner has caused by failing to disclose meetings he's held with foreign officials.
"Don't give up Republican Senators, the World is watching: Repeal & Replace", Trump said in a Twitter comment. Ms Sanders is one of the few names who transitioned from the campaign and gained more trust from the USA president, as others such as Reince Priebus, Sean Spicer and Stephen Bannon were either ousted or ridiculed. Trump isn't going to change. The president has no such plans, she said.
Days of negative news coverage of Scaramucci's crass rant did not sit well with the president, though Trump himself is no stranger to using coarse language, including boasts of groping women in a 2005 Access Hollywood tape leaked past year. He instinctively likes to be his own chief of staff and he's a pretty bad one.
Among the big challenges that newly minted Chief of Staff John Kelly faces, repairing relationships inside the Republican Party is high on the list.
"But I believe with great confidence that I understand what's needed in the Department of Justice and what President Trump wants".