FBI Director Kash Patel’s push to investigate Trump foe Rep. Eric Swalwell (D-CA) despite a lack of evidence has “raised alarms” among colleagues at the FBI, The Washington Post reported Saturday.

Swalwell has been a vocal critic of Donald Trump, and is running to succeed Gavin Newsom (D) as California’s next governor.

According to The Post, Patel is “pressing to release a decade-old investigative file” involving Swalwell “and a suspected Chinese intelligence operative” despite a dearth of evidence against Swalwell.