(CNN) Cliff Sims, a former White House staffer who wrote a tell-all book, is suing President Donald Trump to stop him from "silencing" Sims as he promotes his book.

Sims is bringing the suit against Trump "in his official capacity as President" and is seeking an injunction against the nondisclosure agreements Trump had him agree to when he worked at the White House.

"I certainly didn't want to do this. I'm probably the least litigious person you can imagine," Sims said Tuesday to CNN's John Berman on "New Day." "I was backed into a corner by some legal action that the Trump folks took, and so I felt like I needed to be able to stand up for myself."

CNN has reached out to the White House for comment on the lawsuit.

Sims' book, "Team of Vipers: My 500 Extraordinary Days in the Trump White House," released in January, is his candid account of a chaotic White House.

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