From the moment President Donald Trump gave Omarosa Manigault Newman a job in his administration last January, she treated 1600 Pennsylvania Avenue like her own playground. The polarizing reality TV personality brought her bridal party of 39 people to the White House for a photo shoot; she hosted a bridal luncheon there, too; and she would regularly breeze into the Oval Office unannounced to chat with her former mentor on The Apprentice, now the leader of the free world. Eventually the White House had enough: On Dec. 12, Omarosa was fired from her $179,700-per-year job as director of communications for the Office of Public Liaison and escorted out of the White House. (She denies that she was fired or escorted out.) According to one report, Omarosa’s swift exit was prompted by a blowup during the White House holiday party. But by Dec. 14, the shrewd TV pro was on Good Morning America spinning the story — and teasing the public with the promise of tantalizing gossip.

“There were a lot of things I observed over the past year that I was uncomfortable with,” she said. “When I have the chance to tell my story, it’s quite a story to tell.” It’s worth a ton of money, too. Insiders estimate Omarosa’s juicy tell-all book about Donald, 71, wife Melania, 47, and Omarosa’s time in the White House could command as much as $10 million. And it could be devastating to Donald and Melania’s marriage: Sources close to Omarosa, 43, tell In Touch that they believe Omarosa intends to betray her former boss and his wife by spilling dark secrets about their marriage. “This could be Donald and Melania’s worst nightmare,” says one Washington, D.C., insider. Political analyst Peter Mathews agrees, telling In Touch that a book focusing on the president’s marriage “would be very damaging. Who knows how he treats Melania in the White House and vice versa.” Omarosa is a huge threat because of the bombshell secrets she may know: “If I were President Trump,” Mathews adds, “I would rather have had her on my staff still.”

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Donald’s 12-year marriage to Melania has been the subject of gossip and speculation for quite some time. After all, the first lady waited six months after Donald’s inauguration to move from their gilded NYC triplex apartment to the White House with their son, Barron, 11. And since she has moved in, the pair have often seemed to have an unorthodox — and at times tense — relationship. Remember that infamous moment in May, caught on video, when Melania swatted her husband’s hand away as he tried to hold her hand? “Omarosa has no doubt been dying to tell the world everything she knows about Melania and Donald’s relationship,” says the D.C. insider, “especially the meaning of the hand swipe. Melania swiping at Donald’s hand could have its very own chapter!”

Another political source says Omarosa has dirt on the Trumps’ “icy” interactions. “She knows how much time they spend together and whether or not they even sleep in the same bedroom,” says a source. “How much does Melania have to put up with? Does she really agree with her husband’s stance on things? Does she believe any of the sexual harassment allegations lodged against him or are they all lies? Does she plan to divorce him once they’re out of the White House? All these questions could be answered.”

Expect a passage or two on Donald’s daughter and close adviser Ivanka, 34, as well. “Donald is captivated by his daughter. This is known. He cannot and will not ever say no to her. Ever. Omarosa knows that. Everyone in the West Wing knows that. So get ready for Omarosa to shed some light on that relationship,” says the D.C. insider. “She may also write that in Donald’s eyes, Ivanka is the real first lady.” Donald and Ivanka’s bond has annoyed Melania in the past, claims the political source. “There was a time when there was friction,” says the source. “That has calmed down now, but Omarosa could reveal how bad the drama got at its worst.”

The president isn’t one to hold back an opinion, a fact confirmed by a casual scan of his controversial Twitter feed. In private, however, he’s even more vocal about what he thinks. The insider believes Omarosa has heard plenty. “She is nothing but savvy, so she keeps notes and doesn’t forget a thing. She observes it all. She doesn’t comment at the time, but she files it all in her head.”

Other details she remembers, according to the political source, include Donald’s skepticism of outsiders. “Omarosa can talk about how he doesn’t trust many people, and that is why he has such a small staff filled with close friends and family,” says the political source. Even though Omarosa likely signed a confidentiality agreement, Donald, who is already plagued by record-low approval ratings and a special counsel investigation into Russia’s meddling in the 2016 election, should be brac- ing himself for what bombshells his former aide may reveal. “The White House is afraid that Omarosa, being as familiar with the media as she is, will dance around all the confidentiality issues as much as she can,” continues the political source. “She will likely write a book, and yes, they should be on edge about what she’ll say.”

It would be in Omarosa’s best interest to start churning out chapters pronto if she wants to command top dollar. “Omarosa really needs to come out first and fast. The media doesn’t like old stories and neither do readers,” says writer and media strategist Mark Macias, who adds that Omarosa will almost certainly risk making an enemy of Donald by doing this.

It could be the juiciest tell-all ever written. As Omarosa said herself, “Certainly, I had more access [to President Trump] than most.” She knows so much, “and she’s planning to tell her story,” promises the D.C. insider. “This could be catastrophic for Donald and Melania.”