Retired Lt. Col. Ralph Peters, a former Fox News contributor who in the past harshly criticized former President Barack Obama’s foreign policy, unloaded on his former network in an interview with CNN Wednesday night for its part in pushing a baseless conspiracy theory about the FBI spying on President Donald Trump’s 2016 campaign.

“For years, I was glad to be associated with Fox. It was a legitimate conservative and libertarian outlet, and a necessary one,” Peters said. “But with the rise of Donald Trump, Fox did become a destructive propaganda machine and I don’t do propaganda for anyone.”

Peters said the network’s prime-time opinion hosts shoulder the blame for undermining public support in the FBI and special counsel Robert Mueller’s investigation into Russian interference in the 2016 election. Hosts like Sean Hannity have been repeatedly pushing unfounded theories for the past year about a “deep state” determined to tear down Trump and his administration.

“I suspect Hannity really believes it. The others are smarter. They know what they’re doing,” Peters said. “It’s bewildering to me. I mean, I wanted to just cry out and say, how can you do this? How can you lie to our country? How can you knowingly attack our Constitution, the bedrock of our system of government, the bedrock of our country?”

Peters, who spent much of his military career focusing on Russia, wrote in a Washington Post op-ed in March that Fox News blocked him from speaking about Russia on the network. On CNN, Peters has no such restrictions, and accused Trump of being in the grip of Vladimir Putin.