WASHINGTON, DC - OCTOBER 12:  Director of Communications for the White House Public Liaison Office Omarosa Manigault 
attends a nomination announcement at the East Room of the White House October 12, 2017 in Washington, DC. President Donald Trump has nominated Nielsen to be the next homeland security secretary, the position that has left vacant by Chief of Staff John Kelly.  (Photo by Alex Wong/Getty Images)
PHOTO: Alex Wong/Getty Images
WASHINGTON, DC - OCTOBER 12: Director of Communications for the White House Public Liaison Office Omarosa Manigault attends a nomination announcement at the East Room of the White House October 12, 2017 in Washington, DC. President Donald Trump has nominated Nielsen to be the next homeland security secretary, the position that has left vacant by Chief of Staff John Kelly. (Photo by Alex Wong/Getty Images)
Now playing
02:00
Trump campaign takes action against Omarosa
michael caputo 0816
PHOTO: CNN
michael caputo 0816
Now playing
02:11
Ex-Trump aide compares Omarosa to Frankenstein
In this Feb. 27, 2017 photo, Omarosa Manigault, director of communications for the White House Office of Public Liaison, listens to Vice President Mike Pence speak during a listening session with the historically black colleges and universities at the Eisenhower Executive Office Building on the White House complex in Washington. (AP/Manuel Balce Ceneta, File)
PHOTO: Manuel Balce Ceneta/AP
In this Feb. 27, 2017 photo, Omarosa Manigault, director of communications for the White House Office of Public Liaison, listens to Vice President Mike Pence speak during a listening session with the historically black colleges and universities at the Eisenhower Executive Office Building on the White House complex in Washington. (AP/Manuel Balce Ceneta, File)
Now playing
01:54
Hear Lara Trump discuss salary with Omarosa
Omarosa Manigault (L)  who was a contestant on the first season of Donald Trump's "The Apprentice" and is now an ordained minister, appears alongside Republican presidential hopeful Donald Trump during a press conference November 30, 2015  that followed Trump's meeting with African-American religious leaders in New York. AFP PHOTO / TIMOTHY A. CLARY / AFP / TIMOTHY A. CLARY        (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
PHOTO: TIMOTHY A. CLARY/AFP/Getty Images
Omarosa Manigault (L) who was a contestant on the first season of Donald Trump's "The Apprentice" and is now an ordained minister, appears alongside Republican presidential hopeful Donald Trump during a press conference November 30, 2015 that followed Trump's meeting with African-American religious leaders in New York. AFP PHOTO / TIMOTHY A. CLARY / AFP / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Now playing
01:16
Omarosa used to be Trump's biggest fan
Omarosa Manigault (R), White House Director of Communications for the Office of Public Liaison, sits behind US President Donald Trump as he speaks during a meeting with teachers, school administrators and parents in the Roosevelt Room of the White House in Washington, DC, February 14, 2017. / AFP / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
PHOTO: SAUL LOEB/AFP/Getty Images
Omarosa Manigault (R), White House Director of Communications for the Office of Public Liaison, sits behind US President Donald Trump as he speaks during a meeting with teachers, school administrators and parents in the Roosevelt Room of the White House in Washington, DC, February 14, 2017. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Now playing
01:38
Trump calls Omarosa 'lowlife', 'dog' in tweet
PHOTO: CBS/Spartina Productions
Now playing
01:15
Late night comics take on Omarosa
PHOTO: CNN
Now playing
01:14
Borger: Trump and Omarosa deserve each other
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)
PHOTO: DOMINICK REUTER/AFP/Getty Images
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)
Now playing
02:39
Omarosa recording renews security concerns
n this March 12, 2017 file photo, White House Director of communications for the Office of Public Liaison Omarosa Manigault, right, walks past President Donald Trump during a meeting on healthcare in the Roosevelt Room of the White House in Washington. (AP/Pablo Martinez Monsivais)
PHOTO: Pablo Martinez Monsivais/AP
n this March 12, 2017 file photo, White House Director of communications for the Office of Public Liaison Omarosa Manigault, right, walks past President Donald Trump during a meeting on healthcare in the Roosevelt Room of the White House in Washington. (AP/Pablo Martinez Monsivais)
Now playing
01:24
Omarosa releases recording of call with Trump
james clapper omarosa recordings unthinkable erin sot vpx_00002225.jpg
james clapper omarosa recordings unthinkable erin sot vpx_00002225.jpg
Now playing
02:08
Clapper: Omarosa recordings are 'unthinkable'
PHOTO: NBC
Now playing
01:52
Listen to Omarosa being fired by John Kelly
Meet The press Omarosa
PHOTO: NBC
Meet The press Omarosa
Now playing
02:48
Omarosa: I was complicit in helping deceive US
Trump comes outside @ 16:01:06;08  White House: POTUS meets with Bikers for Trump  THE PRESIDENT participates in a photo opportunity with Bikers for Trump and supporters   The President will welcome approximately 180 bikers made up of Veterans, law enforcement, supporters and members from the "Bikers for Trump" New Jersey chapter to Bedminster where he will host a photo opportunity. With nearly 100,000 members across the country, Bikers for Trump is a major grassroots organization that supports the Administration's agenda.
PHOTO: Pool
Trump comes outside @ 16:01:06;08 White House: POTUS meets with Bikers for Trump THE PRESIDENT participates in a photo opportunity with Bikers for Trump and supporters The President will welcome approximately 180 bikers made up of Veterans, law enforcement, supporters and members from the "Bikers for Trump" New Jersey chapter to Bedminster where he will host a photo opportunity. With nearly 100,000 members across the country, Bikers for Trump is a major grassroots organization that supports the Administration's agenda.
Now playing
01:54
Trump on Omarosa: She's a 'low-life'
HOLLYWOOD, CA - DECEMBER 07:  Omarosa Manigault attends The Hollywood Reporter's Annual Women in Entertainment Breakfast in Los Angeles at Milk Studios on December 7, 2016 in Hollywood, California.  (Photo by Kevin Winter/Getty Images for The Hollywood Reporter )
PHOTO: Kevin Winter/Getty Images North America/Getty Images for The Hollywood Reporter
HOLLYWOOD, CA - DECEMBER 07: Omarosa Manigault attends The Hollywood Reporter's Annual Women in Entertainment Breakfast in Los Angeles at Milk Studios on December 7, 2016 in Hollywood, California. (Photo by Kevin Winter/Getty Images for The Hollywood Reporter )
Now playing
03:03
WH slams Omarosa book as 'filled with lies'
WASHINGTON, DC - OCTOBER 27: Director of Communications for the White House Public Liaison Office Omarosa Manigault Newman listens during the daily press briefing at the White House, October 27, 2017 in Washington, DC. (Drew Angerer/Getty Images)
PHOTO: Drew Angerer/Getty Images North America/Getty Images
WASHINGTON, DC - OCTOBER 27: Director of Communications for the White House Public Liaison Office Omarosa Manigault Newman listens during the daily press briefing at the White House, October 27, 2017 in Washington, DC. (Drew Angerer/Getty Images)
Now playing
02:03
Omarosa's new book is 'Unhinged'
title:  duration: 00:00:00 site:  author:  published:  intervention: yes description:
PHOTO: CBS
title: duration: 00:00:00 site: author: published: intervention: yes description:
Now playing
01:08
Omarosa warns America of 'extreme' Pence
(CNN) —  

Omarosa Manigault Newman’s publisher has responded to President Donald Trump’s campaign’s “legal threats” over her tell-all book, saying Trump is fully able to use his “bully pulpit” to refute anything they take issue with – but that the book will be published.

The Trump campaign also filed an arbitration action Tuesday against Manigault Newman, alleging she breached a 2016 confidentiality agreement she signed.

Responding to a letter from Charles Harder, who is litigation counsel for the Trump campaign, book publisher Simon and Schuster’s outside counsel Elizabeth McNamara wrote: “While your letter generally claims that excerpts from the book contain ‘disparaging statements,’ it is quite telling that at no point do you claim that any specific statement in the book is false. Your client does not have a viable legal claim merely because unspecified truthful statements in the Book may embarrass the president or his associates. At base, your letter is nothing more than an obvious attempt to silence legitimate criticism of the president.”

“Put simply, the book’s purpose is to inform the public. Private contracts like the NDA may not be used to censor former or current government officials from speaking about non-classified information learned during the course of their public employment.”

Harder did not immediately respond to a request for the letter he sent to Simon and Schuster.

“Your letter recounts at great length the details of a non-disclosure agreement between former White House Senior Staffer Omarosa Manigault-Newman’s and the Trump Campaign (the “NDA”), and threatens that publication of Ms. Manigault-Newman’s book, Unhinged: An Insider’s Account of the Trump White House (the “Book”), will be subject S&S to ‘substantial monetary damages and punitive damages’ for various legal claims arising from the Book and the NDA,” the Simon and Schuster letter said.

“My clients will not be intimidated by hollow legal threats and have proceeded with publication of the Book as schedule,” it added. “Should you pursue litigation against S&S, we are confident that documents related to the contents of the Book in the possession of President Trump, his family members, his businesses, the Trump Campaign, and his administration will prove particularly relevant to our defense.”

Simon and Schuster’s director of corporate communications Adam Rothberg said in a statement to CNN that “despite various legal claims and threats made by representatives of the Trump campaign” Gallery Books and Simon & Schuster are proceeding as planned with publication of “Unhinged,” noting they are “confident that we are acting well within our rights and responsibilities as a publisher.”