Former White House aide Cliff Sims said Tuesday night that he's yet to receive formal notice of legal action from the Trump campaign after the president alleged he violated a nondisclosure agreement with his new tell-all book.

"At this point all it is is tweets," Sims said on CNN. "I haven’t seen any, I haven’t been sent anything on that. So just kind of waiting to see on that."

Sims indicated he's not concerned about a potential lawsuit, but acknowledged that he likely signed a nondisclosure agreement similar to those agreed to by former White House press secretary Sean Spicer Sean Michael SpicerKellyanne Conway to leave White House at end of month Pro-Trump duo Diamond and Silk launch new program on Newsmax TV The Hill's 12:30 Report - Presented by Facebook - Supreme Court's unanimous decision on the Electoral College MORE and former campaign aides Corey Lewandowski Corey R. LewandowskiHow Trump can win reelection: Focus on Democrats, not himself Trump Jr. distances from Bannon group, says he attended 'single' event Bannon, three others charged with defrauding donors of 'We Build The Wall' campaign MORE and David Bossie. Each of those individuals have written books about their time working with the president.

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Sims, who has been on a media blitz to promote his book "Team of Vipers: My 500 Extraordinary Days in the Trump White House," was the target of a tweet from President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Tuesday morning. The president dismissed Sims as a "low level staffer that I hardly knew," and derided the book as "fiction."

"I think it probably has honestly more to do with the coverage of the book than the book itself," Sims said. "He hasn’t read it. He won’t read it, and that’s OK."

"Team of Vipers" author, former Trump WH aide @Cliff_Sims describes his time in the White House as suddenly finding himself "a participant in this game of thrones." https://t.co/C7PFdjr9Av pic.twitter.com/771j6BAam4 — Anderson Cooper 360° (@AC360) January 29, 2019

Sims said he expected there was a chance Trump could lash out over the book given his tendency to do so toward other White House tell-alls.

During his roughly 18 months in the Trump administration, Sims served as director of White House message strategy and a special assistant to the president, sitting in on high-level meetings. He left his position last May.

In excerpts released from the book, Sims has described sitting with Trump and creating a list of problematic individuals working in the White House. Another excerpt describes Trump deriding former Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.).

Sims also described White House counselor Kellyanne Conway Kellyanne Elizabeth ConwayGeorge and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death George Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' MORE as a "cartoon villain brought to life" who bad-mouthed other staffers to the press.

On CNN, Sims likened the ongoing efforts among staffers to gain favor with Trump to a "game of thrones" where each person sought to push out rival aides.

"It revealed a lot about myself. I learned a lot about myself there, and I can only speak from my personal experience there that I’d never had that kind of proximity to power," he said. "I’d never gotten to interact with the most powerful person in the world."

Sims's book is the latest in a string of insider books that have been written about the Trump White House. Former staffer 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, veteran journalist Bob Woodward and author Michael Wolff each wrote books that described the administration as a chaotic environment where the president and his advisers disparaged one another on a regular basis.

In each case, the president has lashed out at the author and pushed back against the claims made in the book. Trump called Woodward an "idiot," Manigault Newman a "dog" and described Wolff's work as a "fake book."

Each of those books spent time at No. 1 on The New York Times's best-seller list.