White House press secretary Sarah Huckabee Sanders on Tuesday would not say whether she's signed a nondisclosure agreement since joining the Trump administration, but asserted it's "common" for government employees to sign such documents.

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"I’m not going get into the back and forth on who has signed an NDA here at the White House," Sanders said at a press briefing when asked whether she's signed such a document.

"I can tell you that it’s common in a lot of places for employees to sign NDAs, including in government, particularly anyone with a security clearance," she added.

Reporter: Sarah, have you signed an NDA?



Sanders: I'm not going to get into the back and forth... pic.twitter.com/fWs6BC3HYi — Salvador Hernandez (@SalHernandez) August 14, 2018

The question about requiring White House staffers to sign nondisclosure agreements has emerged as a point of contention as former White House aide Omarosa Manigault Newman Omarosa Onee Manigault NewmanTrump hurls insults at Harris, Ocasio-Cortez and other women Pelosi makes fans as Democrat who gets under Trump's skin The Memo: Impeachment's scars cut deep with Trump, say those who know him MORE has published a new book filled with explosive claims about her time on the Trump campaign and as an aide in the Trump administration.

In her book released Tuesday, “Unhinged: An Insider’s Account of the Trump White House," Manigault Newman alleges President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE is a racist, a misogynist and a narcissist, and claims he repeatedly used the N-word on the set of “The Apprentice.”

Trump has lashed out at Manigault Newman in response, calling her a "dog" and a "lowlife.

The Trump campaign escalated the president's war with Manigault Newman earlier Tuesday when it filed for arbitration, alleging she violated a nondisclosure agreement.

The campaign claims that by publishing the book, Manigault Newman violated the terms of a 2016 confidentiality agreement she signed with the campaign.

Asked Tuesday why compelling Manigault Newman to defend herself and potentially pay damages is necessary, Sanders said she could not speak on behalf of the campaign. However, she re-asserted that it's "very normal" to require staffers to sign NDAs, arguing that "this White House is certainly no different" from past administrations.

Manigault Newman has acknowledged she signed a confidentiality agreement with the 2016 campaign but has denied signing a similar agreement upon leaving the White House.

The White House has in recent days confirmed its practice of requiring West Wing staffers to sign nondisclosure agreements, despite concerns from watchdogs that such documents are unenforceable and uncommon for public employees.

White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE confirmed the existence of the agreements during an appearance on ABC's "This Week," defending them as needed to ensure privacy.

"We’ve all signed them in the West Wing," she said. "We have confidentiality agreements in the West Wing, absolutely we do. And why wouldn’t we?"

After Trump tweeted that Manigault Newman signed a nondisclosure agreement, the American Civil Liberties Union called the practice unconstitutional, saying Trump was attempting to “muzzle federal employees.”