Edward Snowden weighed in as the directors of the National Security Agency and Federal Bureau of Investigation testified before the House Intelligence Committee Monday.

The former NSA contractor said he noticed a “red flag” as the two men took questions from Congress members about leaks of classified information to the press.

“Red flag: NSA Director careful to discuss only who can unmask USP identities in reporting, not who can access collection involving USPs,” Snowden tweeted Monday. “How many communications in which at least one participant is American are held by the NSA?”

“The question not answered in Congress today.” (RELATED: Comey Confirms FBI Is Investigating Links Between Trump Campaign And Russia)

Red flag: NSA Director careful to discuss only who can unmask USP identities in reporting, not who can access collection involving USPs. — Edward Snowden (@Snowden) March 20, 2017