The US director of national intelligence, Tulsi Gabbard, has said that the invitation extended to journalist Jeffrey Goldberg to join a Signal chat group with senior US security officials discussing an attack on Yemen's Houthis was 'inadvertent' and 'a mistake', but insisted again that nothing classified was shared. Speaking at a Senate hearing, Gabbard said: 'The conversation was candid and sensitive, but as the president and the national security advisor stated, no classified information was shared'

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