The White House says screenshots of a top US officials group chat didn't contain classified information. 

The Atlantic magazine editor-in-chief Jeffrey Goldberg was accidentally added to a group thread on the encrypted messaging app Signal. 

Screenshots made public overnight include exact timings of drone and missile attacks on the Iran-backed Houthis, followed by updates on targets hit. 

US Correspondent Mitch McCann told Andrew Dickens the Democrats claim the messages were classified. 

He says they're now calling on Defence Secretary Pete Hegseth, who sent some of the messages, to resign.