Former White House staffer Omarosa Manigault NewmanOmarosa Manigault NewmanJudge denies Omarosa Manigault Newman request to depose Trump, John Kelly in lawsuit Tanden seeks to defuse GOP tensions over tweets Juan Williams: The GOP's problem with women of color MORE said Saturday that former Trump attorney Michael Cohen would cross a “big red line” for the president if he discusses President TrumpDonald TrumpWhat blue wave? A close look at Texas today tells of a different story Democrats go down to the wire with Manchin Trump's former bodyguard investigated in NY prosectors' probe: report 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 TrumpIvanka TrumpNYC voters set to decide Vance's replacement amid Trump probe Ukraine sanctions two businessmen tied to Giuliani Michael Cohen predicts Trump will turn on family after revelation of criminal probe MORE, Jared, her husband, and the children, Don and Eric TrumpEric TrumpFlorida city bans gambling amid prospects of Trump-owned casino Lara Trump on Senate bid: 'No for now, not no forever' Lara Trump disputes report that father-in-law is discussing reinstalment 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 KushnerTrump discussed sending infected Americans to Guantanamo Bay: book NYC voters set to decide Vance's replacement amid Trump probe Kushner lands book deal, slated for release in 2022 MORE both serve as senior advisers to the president at the White House, while the president's adult sons, Donald Trump Jr.Don TrumpDonald Trump Jr. joins Cameo Book claims Trump family members were 'inappropriately' close with Secret Service agents Trump Jr. shares edited video showing father knocking Biden down with golf ball 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.”