"I hope John Brennan, the worst CIA Director in our country’s history, brings a lawsuit. It will then be very easy to get all of his records, texts, emails and documents to show not only the poor job he did but how he was involved with the Mueller Rigged Witch Hunt. He won’t sue!" Trump said via Twitter.
In an interview on Sunday, Brennan said he would go to court if necessary to prevent any other current or former officials from having their security clearances revoked.
On Wednesday, Trump revoked Brennan's security clearance, saying the former intelligence official was using his status to make unfounded and outrageous allegations against him. The White House is also reviewing the security clearances of other officials from former President Barack Obama's administration.
Brennan served as CIA Director from 2013-2017.