President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE and some of his aides are reportedly upset with acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE for not being prepared to deal with the fallout from the whistleblower report.

CNN reported Sunday that Mulvaney was not prepared to justify what the whistleblower complaint or the memorandum of Trump's call with Ukrainian President Volodymyr Zelensky said.

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A source told the news outlet that some in the White House were frustrated with Mulvaney, saying the lack of response sparked more controversy.

White House press secretary Stephanie Grisham Stephanie GrishamIvana Trump on Melania as first lady: 'She's very quiet, and she really doesn't go to too many places' The Hill's 12:30 Report: Trump uses White House as campaign backdrop Coronavirus tests not required for all Melania Trump speech attendees: report MORE said in a statement to The Hill on Monday that the reports on Mulvaney were "manufactured palace intrigue."

"The fact is that President Trump and this Administration have done nothing wrong," Grisham said. "Why would we need to implement a strategy to explain the contents of a document we willingly released? Sounds to me like more anonymous troublemakers working to stir the pot for their own selfish reasons."

Sources told CNN that the president may not push to fire Mulvaney right now in the midst of the impeachment inquiry.

The president has had two previous White House chiefs of staff before Mulvaney.

Updated on Monday at 2:10 p.m.