The former White House aide also claims she's heard Trump use the n-word on tape, and says "he is truly a racist."
The former White House aide, who was promoting her new tell-all memoir, told Chuck Todd, "It is hindsight. But I will say this to you, I was complicit with this White House deceiving this nation," and suggested that it's still happening.
She explained, "They continue to deceive this nation by how mentally declined [Trump] is, how difficult it is for him to process complex information, how he is not engaged in some of the most important decisions that impacts our country. I was complicit, and for that I regret."
She also said she was inadvertently complicit in covering up Trump's perceived racism. In her new memoir, "Unhinged: An Insider's Account of the Trump White House," due in stores Tuesday, Omarosa details an unsuccessful quest to find a tape dating back to Trump's "Apprentice" days where he uses the n-word.
Now, though, she says she's since heard the tape. "Once I heard it for myself, it was confirmed, what I feared the most: That Donald Trump is a con and has been masquerading as someone who is actually open to engaging with diverse communities. But when he talks that way, the way he did on this tape, it confirmed that he is truly a racist."
Omarosa defended Trump a year ago after he responded to the racially charged Charlottesville riot that left one woman dead by saying that there was "blame on both sides" and "very fine people on both sides." On the Saturday anniversary of the riot, Trump tweeted, "I condemn all types of racism and acts of violence," which some have interpreted as more waffling, as reported by USA Today.
Omarosa was able to seemingly back claims of another tape when she played audio recording that appeared to be of the moment Chief of Staff John Kelly fired her from the White House. She said she recorded the meeting, which occurred in the Situation Room, because she was feeling threatened.
"I protected myself because this is a White House where everybody lies; the president lies to the American people, Sarah Huckabee [Sanders] stands in front of the country and lies every single day," she said. "You have to have your own back or else you'll look back and you'll have 17 knives in your back."
Sanders spoke out against Omarosa's book in a statement released Friday, saying, "Instead of telling the truth about all the good President Trump and his administration are doing to make America safe and prosperous, this book is riddled with lies and false accusations."
She went on to add, "It's sad that a disgruntled former White House employee is trying to profit off these false attacks, and even worse that the media would now give her a platform, after not taking her seriously when she had only positive things to say about the President during her time in the administration."
The president appeared to back this sentiment on Saturday when he spoke before reporters and called Omarosa a "lowlife" when asked about her book, as Business Insider reported.
"Meet the Press" was Omarosa's first stop on her whirlwind press tour, so expect more bombshell revelations and White House denials in the days to come.