Former White House staffer Omarosa Manigault NewmanOmarosa Onee Manigault NewmanTrump snapped at McMaster for taking notes during meeting: report Trump plotting tell-all book: report Black journalists' group places CNN on 'special monitoring list' MORE said Saturday that former Trump attorney Michael Cohen would cross a “big red line” for the president if he discusses President TrumpDonald John TrumpForget the spin: Five unrefuted Mueller Report revelations Lara Trump: Merkel admitting migrants 'one of the worst things that ever happened to Germany' Financial satisfaction hits record high: survey MORE’s children during congressional testimony next week.

Manigault Newman told MSNBC host Alex Witt that she would be interested in "how much [Cohen] shares about the role of Trump’s children in a lot of these deals, including senior adviser Ivanka TrumpIvana (Ivanka) Marie TrumpAuthor of book on Kushners mocks Jared: He couldn't get a TSA PreCheck without Trump's help Africa's women can change a continent: Will Ivanka give them her full support? A Trump visit to Africa is important — and carries some urgency MORE, Jared, her husband, and the children, Don and Eric TrumpEric Frederick TrumpLara Trump: Merkel admitting migrants 'one of the worst things that ever happened to Germany' House Dem calls on lawmakers to 'insulate' election process following Mueller report Lara Trump to 'Fox & Friends': Trump 'one of the greatest presidents we've ever had' MORE."

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“There is no question that that big red line for Donald Trump is his children, particularly Ivanka, and once Michael Cohen starts sharing details that may actually implicate them, you will see him truly become unhinged,” she said of the president.

Ivanka Trump and her husband Jared KushnerJared Corey KushnerDemocrats are playing voters on their fantasies for impeachment Author of book on Kushners mocks Jared: He couldn't get a TSA PreCheck without Trump's help What Jared Kushner has to tell Donald Trump on immigration MORE both serve as senior advisers to the president at the White House, while the president's adult sons, Donald Trump Jr.Donald (Don) John Trump21 questions for Robert Mueller Oregon governor names big game hunter to board that oversees gray wolf management Trump Jr. slams 2020 Dems as 'more concerned' about rights of murderers than legal gun owners MORE and Eric Trump, have overseen his personal business empire since he entered office.

Manigault Newman has emerged as one of Trump's most vocal detractors since her departure from the White House in 2017. She wrote a tell-all book published last year titled "Unhinged: An Insider's Account of the Trump White House," which contains several damning anecdotes about the administration's inner workings.

Cohen is slated to appear for several days of testimony before three congressional panels in the coming week. He is scheduled to testify behind closed doors before the Senate Intelligence Committee on Tuesday, appear publicly before the House Oversight and Reform Committee on Wednesday and then privately testify before the House Intelligence Committee on Thursday.

Democratic lawmakers have signaled that they are eager to hear Cohen’s testimony regarding an array of Trump’s private business dealings during his years working as the then-businessman's personal lawyer and "fixer."

“Interacting with Michael Cohen and Donald Trump is a very interesting dynamic, because Michael Cohen truly did work that most people would find a little interesting," Manigault Newman said Saturday.

"Donald relied on him to carry out so many different tasks, and I think on Wednesday what you’ll see is a man who wants to share the inner workings of the Trump crime family."

Cohen has been under intense public scrutiny since he pleaded guilty to a slew of charges in August, including campaign finance violations stemming from payments he says he made at Trump’s direction to silence women who alleged affairs with Trump.

The lawyer also separately pleaded guilty to lying to Congress about plans to build a Trump Tower in Moscow. 

Cohen is expected to start a three-year prison sentence in May.

Trump has denied any wrongdoing and slammed his former lawyer as a liar and a “rat.”