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White House press secretary Sarah Huckabee Sanders couldn’t guarantee on Tuesday that the American public would never hear a recording of President Donald Trump saying the N-word.

“Can you stand at the podium and guarantee the American people they’ll never hear Donald Trump utter the N-word on a recording in any context?” NBC’s Kristen Welker asked during Tuesday’s White House press briefing.

“I can’t guarantee anything, but I can tell you that the president addressed this question directly,” Sanders responded, referring to the president’s tweet Monday night denying that he had ever used the racial slur. “I can tell you that I’ve never heard it.”

She later added, “I haven’t been in every single room.”

.@kwelkernbc: "Can you stand at the podium and guarantee the American people they'll never hear Donald Trump utter 'the n word' on a recording, in any context?" Sarah Sanders: "I can't guarantee anything… I can tell you I've never heard it." pic.twitter.com/rSDj4ctA5a — MSNBC (@MSNBC) August 14, 2018

Rumors of a tape featuring Trump using the N-word during his work on NBC’s The Apprentice first emerged during the 2016 campaign and resurfaced in recent days ahead of the publication of a memoir by Omarosa Manigault Newman, the former White House aide and Apprentice contestant. The promotion of Manigault Newman’s book has included the release of three audio clips she says she surreptitiously recorded in the White House and on the campaign trail.

The newest recording, which was released hours before Tuesday’s press briefing, purported to catch Trump campaign staffers discussing the potential fallout of the alleged Apprentice tape and how they would “spin” it. On the recording, Trump campaign spokeswoman Katrina Pierson can be heard saying, “No, he said it. He is embarrassed.”

During the same press briefing, Sanders also declined to state whether she had signed a nondisclosure agreement upon joining the Trump administration. (The Trump campaign has reportedly filed an arbitration action alleging that Newman violated her nondisclosure agreement in her recent publicity blitz.) She did, however, falsely claim that signing one is common practice for government employees.