Former White House aide Omarosa Manigault Newman said Tuesday that there’s one longtime member of President Donald Trump’s inner circle who could reveal everything if called to testify.

MSNBC’s Chris Matthews spoke with the former “Apprentice” contestant about the new investigation into Trump launched by House Democrats, who sent document requests to 81 people and entities close to the president.

“Who do you think Trump fears most will be brought in?” Matthews asked.

“One name: Rhona Graff,” Manigault Newman replied without hesitation, referring to Trump’s longtime personal secretary.

“She knows everyone. She knows the role they play. She knows who said what and when. She set up the meetings,” Manigault Newman said. “If she is called to testify, that will be the end of Donald Trump.”

23 PHOTOS Omarosa out and about See Gallery Omarosa out and about WASHINGTON, DC - MARCH 29: Counselor to the President Kellyanne Conway (L) and Omarosa Manigault (R) attend an event celebrating Women's History Month, in the East Room at the White House March 29, 2017 in Washington, DC. (Photo by Mark Wilson/Getty Images) Omarosa Manigault, President Donald Trump's Director of Communications for the Office of Public Liaison, was present for the White House press briefing in the James S. Brady Press Briefing Room of the White House, on Monday, June 5, 2017. (Photo by Cheriss May/NurPhoto via Getty Images) WASHINGTON, DC - FEBRUARY 14: Omarosa Manigault, aide to President Donald Trump, watches during a meeting with parents and teachers in the Roosevelt Room of the White House in Washington, DC on Tuesday, Feb. 14, 2017. (Photo by Jabin Botsford/The Washington Post via Getty Images) WASHINGTON, DC - FEBRUARY 16: White House staff member Omarosa Manigault (L), takes selfie with other staff members before President Donald Trump's news conference where he announced Alexander Acosta as the new Labor Secretary nominee in the East Room at the White House on February 16, 2017 in Washington, DC. President Trump also fielded questions from reporters. (Photo by Mark Wilson/Getty Images) PASADENA, CA - FEBRUARY 11: Omarosa Manigault attends the 48th NAACP Image Awards at Pasadena Civic Auditorium on February 11, 2017 in Pasadena, California. (Photo by Jason LaVeris/FilmMagic) Omarosa Manigault, a staffer for US President-elect Donald Trump, listens as Martin Luther King III speaks to the media after meeting with the President-elect at Trump Tower in New York City on January 16, 2017. / AFP / DOMINICK REUTER (Photo credit should read DOMINICK REUTER/AFP/Getty Images) WASHINGTON, DC - JANUARY 12: Omarosa Manigault, incoming White House director of communications for the Office of Public Liaison, listens as Ben Carson, Secretary of Housing and Urban Development-designate, testifies before Senate Banking, Housing and Urban Affairs Committee during his confirmation hearing at the Dirksen Senate Office Building on Capitol Hill on January 12, 2017 in Washington, DC. (Photo by Leigh Vogel/WireImage) Omarosa Manigault, director of African American outreach for President-elect Donald Trump, arrives at Trump Tower in New York, U.S., on Tuesday, Dec. 13, 2016. Exxon Mobil Corp. Chief Executive Officer Rex Tillerson will be nominated as Trump's secretary of state, setting up a potential confirmation battle with U.S. lawmakers who have questioned the oilman's relationship with Russian President Vladimir Putin. Photographer: John Taggart/Bloomberg via Getty Images HOLLYWOOD, CA - DECEMBER 07: Omarosa Manigault arrives at the The Hollywood Reporter's 25th Annual Women In Entertainment Breakfast at Milk Studios on December 7, 2016 in Hollywood, California. (Photo by Steve Granitz/WireImage) LAS VEGAS, NV - NOVEMBER 06: TV personality Omarosa Manigault attends the 2016 Soul Train Music Awards at the Orleans Arena on November 6, 2016 in Las Vegas, Nevada. (Photo by Mindy Small/FilmMagic) NATIONAL HARBOR, MD - DECEMBER 08: Omarosa Manigault attends the MGM National Harbor Grand Opening Gala on December 8, 2016 in National Harbor, Maryland. (Photo by Paul Morigi/Getty Images for MGM National Harbor) LAS VEGAS, NV - NOVEMBER 04: (L-R) Television personality Omarosa Manigault, BET EVP of Strategy and Operations Richard Gay, and Chef Huda attend 'Soul Lunch & Greens: A Charity Golf Experience' at Top Golf at MGM Grand Hotel & Casino during Soul Train Weekend on November 4, 2016 in Las Vegas, Nevada. (Photo by Bryan Steffy/BET/Getty Images for BET) INGLEWOOD, CA - OCTOBER 08: Omarosa Manigault and Bishop Kenneth Ulmer attend the Inform Your Vote President Election Debate at The Tabernacle on October 8, 2016 in Inglewood, California. (Photo by Todd Williamson/WireImage) HOLLYWOOD, CA - AUGUST 17: Omarosa Manigault attends the premiere of 'Ben-Hur' at TCL Chinese Theatre IMAX on August 16, 2016 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic) HOLLYWOOD, CA - AUGUST 17: Omarosa Manigault attends the premiere of 'Ben-Hur' at TCL Chinese Theatre IMAX on August 16, 2016 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic) LOS ANGELES, CA - JUNE 24: TV personality Omarosa Manigault participates in the 2016 BETX Celebrity Golf sponsored by Nike on June 24, 2016 in Los Angeles, California. (Photo by Matt Winkelmeyer/BET/Getty Images for BET) LOS ANGELES, CA - MAY 24: TV Personality Omarosa Manigault attends the Jovani store opening celebration at Jovani on May 24, 2016 in Los Angeles, California. (Photo by Paul Archuleta/Getty Images ) TV personality Omarosa Onee Manigault arrives for the 102nd White House Correspondents' Association Dinner in Washington, DC, on April 30, 2016. / AFP / Andrew Biraj (Photo credit should read ANDREW BIRAJ/AFP/Getty Images) WASHINGTON, DC - APRIL 30: Omarose Onee Manigault attends the Garden Brunch prior to the 102nd White House Correspondents' Association Dinner at the Beall-Washington House on April 30, 2016 in Washington, DC. (Photo by Paul Morigi/WireImage) WASHINGTON, DC - APRIL 29: Omarosa Manigault attends the Google/HBO celebration of 'All The Way' during White House Correspondents' weekend at the Renwick Gallery on April 29, 2016 in Washington, DC. (Photo by Paul Morigi/Getty Images for Google) PASADENA, CA - FEBRUARY 05: TV personality Omarosa Manigault attends the 47th NAACP Image Awards presented by TV One at Pasadena Civic Auditorium on February 5, 2016 in Pasadena, California. (Photo by Imeh Akpanudosen/Getty Images for NAACP Image Awards) NEW YORK, NY - APRIL 14: Omarosa Manigault attends Aretha Franklin's 74th Birthday Celebration at The Ritz Carlton Hotel on April 14, 2016 in New York City. (Photo by Steve Mack/Getty Images) WASHINGTON, DC - JUNE 30: White House Office of Public Liaison Communications Director Omarosa Manigault (L) and Deputy Press Secretary Sarah Huckabee Sanders arrive prior to U.S. President Donald Trump and South Korean President Moon Jae-in delivering joint statements in the Rose Garden of the White House on June 30, 2017 in Washington, DC. President Moon is on a three-day visit in Washington. He had an Oval Office meeting with President Trump prior to joint statements. (Photo by Mark Wilson/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

However, she also said it’s possible Graff won’t spill the beans on her longtime boss.

“I wouldn’t be surprised if she pled the Fifth,” she said, meaning she would refuse to testify. “It wouldn’t surprise me at all, because she’s been fiercely loyal to the president of the United States.”

Graff has worked for Trump for around 30 years, Politico reported in a profile published in March 2017, noting that many people seeking access to the president still go through her rather than via the White House.

“I go through Rhona,” Roger Stone told the website at the time. “She’s a woman of excellent judgment who reflects her boss’ views. She has to field requests from a lot of people.”

Stone was arrested and charged in January in special counsel Robert Mueller’s investigation into Russian interference in the 2016 election.

The Politico profile also noted at the time that former campaign manager Paul Manafort kept in touch with Trump via Graff, albeit infrequently.

Manafort is in jail and awaiting sentencing after pleading guilty last year in connection with the Mueller investigation.

This article originally appeared on HuffPost.

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