America’s intelligence agencies risk slipping back into dangerous pre-9/11 habits, a recently departed top counterterrorism official is warning in his first public remarks on the matter.

Russell Travers, the former head of the U.S. government’s hub for analysis of counterterrorism intelligence, was so alarmed that he shared his concerns with the intelligence community’s top internal watchdog in his final weeks on the job.

“I think there are really important questions that need to be addressed, and I don’t think they have been thus far,” said Travers, who ran the National Counterterrorism Center (NCTC) until March of this year. “And that has me worried, because I do think we could very easily end up back where we were 20 years ago.”

Travers detailed his concerns, much of which remain highly classified, to the intelligence community’s inspector general. About a week later, he was summarily ousted, he says — and the Trump administration official who fired him didn’t explain why.