Edward Snowden wrote on social media to his nearly 6 million followers, “Do not ever trust @OpenAI … You have been warned,” following the appointment of retired U.S. Army General Paul Nakasone to the board of the artificial intelligence technology company.

Snowden, a former National Security Agency (NSA) subcontractor, was charged with espionage by the Justice Department in 2013 after leaking thousands of top-secret records, exposing the agency’s surveillance of private citizens’ information.

In a Friday morning post on X, formerly Twitter, Snowden reshared a post providing information on OpenAI’s newest board member. Nakasone is a former NSA director, and the longest-serving leader of the U.S. Cyber Command and chief of the Central Security Service. He retired from the NSA, a position he held since 2018, in February.

Snowden wrote in an X post, “They’ve gone full mask-off: do not ever trust @OpenAI or its products (ChatGPT etc.) There is only one reason for appointing an @NSAGov Director to your board. This is a willful, calculated betrayal of the rights of every person on Earth.” He concluded the post, writing, “You have been warned.”