BRIDGEWATER, N.J. -- Former presidential adviser Omarosa Manigault Newman is drawing fire from President Trump's allies and national security experts for secret recordings she made at the White House, including one of her firing by Chief of Staff John Kelly in the high-security Situation Room. Manigault Newman said Sunday on NBC's "Meet the Press" that she surreptitiously recorded a number of conversations in the White House for her own protection. Parts of her conversation with Kelly were played on the air. Critics denounced the recordings as a serious breach of ethics and security.

"Who in their right mind thinks it's appropriate to secretly record the White House chief of staff in the Situation Room?" tweeted Ronna McDaniel, chairwoman of the Republican National Committee.

She also said Manigault Newman could be in legal trouble:

Secretly recording conversations in the Situation Room isn't just wildly inappropriate, it's a threat to our national security. If she broke federal law, she should be prosecuted. — Ronna McDaniel (@GOPChairwoman) August 12, 2018

In the recording, which Manigault Newman quotes extensively in her new book, "Unhinged," Kelly can be heard saying that he wants to talk with Manigault Newman about leaving the White House. The Associated Press independently listened to the recording of the conversation.

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"It's come to my attention over the last few months that there's been some pretty, in my opinion, significant integrity issues related to you," Kelly is heard saying, citing her use of government vehicles and "money issues and other things" that he compares to offenses that could lead to a court martial in the military.

"If we make this a friendly departure ... you can look at your time here in the White House as a year of service to the nation and then you can go on without any type of difficulty in the future relative to your reputation," he tells Manigault Newman, adding, "There are some serious legal issues that have been violated and you're open to some legal action that we hope, we think, we can control."

Manigault Newman said she viewed the conversation as a "threat" and defended her decision to covertly record it and other White House conversations.

"If I didn't have these recordings, no one in America would believe me," she said.

The response from the White House was stinging. "The very idea a staff member would sneak a recording device into the White House Situation Room, shows a blatant disregard for our national security - and then to brag about it on national television further proves the lack of character and integrity of this disgruntled former White House employee," Press Secretary Sarah Huckabee Sanders said in a statement.

The Situation Room is a Sensitive Compartmented Information Facility, or SCIF, where the nation's most consequential foreign policy decisions are made, and staff members aren't permitted to bring in cellphones or other recording devices.

The White House had no official comment on potential disciplinary actions against Manigault Newman or on why Kelly chose to hold a personnel meeting in what's supposed to be one of the most secure rooms in the world.

Ned Price, who served as spokesman of the National Security Council in the Obama administration, said he's "never heard of a more serious breach of protocol. Not only is it not typical, something like this is unprecedented."

Price said there is no one checking staffers for devices at the door, but there is a sign outside the room making clear that electronic devices are prohibited.

"The Situation Room is the inner-most sanctum of a secure campus," he said, describing the breach as part of a culture of disregarding security protocols in the Trump White House. He also questioned why Kelly would ever choose to have such a meeting there.

In the book, which will be released Tuesday, Manigault Newman paints a damning picture of Mr. Trump, including claiming -- without evidence -- that tapes exist of him using the N-word as he filmed his "The Apprentice" reality series, on which she co-starred.

Manigault Newman wrote in the book that she had not personally heard any such recording. But she told Chuck Todd on Sunday that she later was able to hear a recording of Mr. Trump during a trip to Los Angeles. "I heard his voice as clear as you and I are sitting here," she said on the show.

Also, in an interview with NPR Friday, Manigault Newman claimed she had heard a tape on which Mr. Trump said the N-word.

The White House had previously tried to discredit the book, with Sanders calling it "riddled with lies and false accusations." Mr. Trump on Saturday labeled Manigault Newman a "lowlife."

Katrina Pierson, an adviser to the Trump re-election campaign who served as a spokeswoman for his 2016 campaign, said she had never heard Mr. Trump use the kind of derogatory language Manigault Newman describes. She said in a statement that she feels "pity for Omarosa as she embarrasses herself by creating salacious lies and distortions just to try to be relevant and enrich herself by selling books at the expense of the truth. 'Unhinged,' indeed."

White House counselor Kellyanne Conway also questioned Manigault Newman's credibility, in an interview Sunday on ABC's "This Week."

"The first time I ever heard Omarosa suggest those awful things about this president are in this book," she said, noting Manigault Newman "is somebody who gave a glowing appraisal of Donald Trump the businessman, the star of the 'The Apprentice,' the candidate and, indeed, the president of the United States."

Manigault Newman had been a staunch defender of the president for years, including pushing back, as the highest-profile African-American in the White House, on accusations that he was racist.

But Manigault Newman now says she was "used" by Mr. Trump, calling him a "con" who "has been masquerading as someone who is actually open to engaging with diverse communities" and is "truly a racist."

"I was complicit with this White House deceiving this nation," she said. "I had a blind spot where it came to Donald Trump."