National security adviser Jake Sullivan came to Capitol Hill on Thursday to brief senior House lawmakers on a matter described by House Intelligence Committee Chairman Mike Turner (R-OH) as a “serious national security threat.” 

Sullivan’s private briefing, which was only provided to the House contingent of the Gang of Eight, was originally scheduled before Turner released his Wednesday statement calling on President Joe Biden to “declassify all information relating to this threat so that Congress, the Administration, and our allies can openly discuss the actions necessary to respond.”