Stephanie Clifford, the former adult-film actress professionally known as Stormy Daniels, filed a lawsuit on Monday against President Donald Trump in Manhattan federal court, accusing him of defaming her in a recent tweet.

Mr. Trump posted the tweet on April 18, in response to a sketch Ms. Clifford released of a man who allegedly threatened her in 2011. According to Ms. Clifford’s lawsuit, a few weeks after she had agreed to discuss with a magazine an alleged sexual encounter she had with Mr. Trump, the man approached her…