Donald Trump’s lawyer is trying to silence adult-film star Stormy Daniels, obtaining a secret restraining order in a private arbitration proceeding and warning that she faces penalties if she publicly discusses a relationship with the president, NBC News has learned.

The new pressure on Daniels, whose real name is Stephanie Clifford, comes a day after she filed a lawsuit in a Los Angeles court alleging that a nondisclosure agreement she made to keep quiet about an “intimate” relationship with Trump is invalid because he never signed it.