The Senate Intelligence Committee has subpoenaed conspiracy theorist Jerome Corsi, his attorney, Larry Klayman, told The Hill on Friday.

The committee asked for both an interview and documents from the Roger Stone associate in a subpoena received Thursday, according to Klayman.

Corsi is a “birther”-promoting conservative commentator who came under scrutiny in the Russia investigation for comments he made suggesting he had advance knowledge that Wikileaks planned to release hacked Democratic emails in the summer of 2016. Klayman, the founder of Judicial Watch, is best known for filing frivolous lawsuits against political figures and government agencies.

Klayman told The Hill that he plans to fight the “overly broad” subpoena, calling it the latest example of the “continued harassment” the committee has directed towards his client.

Special counsel Robert Mueller has subpoenaed several associates of Corsi and Stone in recent weeks, including Corsi’s stepson, Andrew Stettner.

Corsi and Stettner reportedly exchanged text messages about a computer of Corsi’s being “scrubbed.”