President Trump said Friday he stands by White House chief of staff John Kelly, following a report that Trump disapproved of the way Kelly was trying to manage him.

"General John Kelly is doing a great job as Chief of Staff. I could not be happier or more impressed — and this Administration continues to get things done at a record clip. Many big decisions to be made over the coming days and weeks. AMERICA FIRST!" Trump said in two tweets Friday morning.

Kelly replaced White House chief of staff Reince Priebus at the end of July, and Kelly has since worked to restore order to the West Wing, restricting the people that have access to Trump and limiting the members of the Trump family who can visit with the president in the Oval Office.

But the Washington Post reported Thursday the president is having a difficult time adjusting to his new chief of staff.

"[Trump's] having a very hard time," one friend who spoke with Trump this week told the Washington Post. "He doesn't like the way the media's handling him. He doesn't like how Kelly's handling him. He's turning on people that are very close to him."

According to the Washington Post, Trump has continued to speak with former White House chief strategist Steve Bannon on his personal cellphone when Kelly isn't around, as well as other business associates and outside advisers.