Trump campaign takes legal action against Omarosa

President Donald Trump's campaign took legal action against Omarosa Manigault Newman on Tuesday, alleging that the former top White House aide was in breach of a 2016 confidentiality agreement, a Trump campaign official said.

Trump's campaign, formally named Donald J. Trump for President, filed an arbitration action Tuesday against Manigault Newman with the American Arbitration Association in New York City, the official told NBC News.

The action is related to claims made by Manigault Newman in her new book, "Unhinged: An Insider's Account of the Trump White House," in which she slammed the president as racist and in mental decline.

In the days leading up its Tuesday release, Manigault Newman has also publicly shared audio recordings made in the White House of Trump and of chief of staff John Kelly.

In an arbitration proceeding, each side submits to the judgment of an independent arbitrator — typically a retired judge — who hears evidence presented by both sides and has the ability to make a ruling or penalize one side.