It remains unclear, however, whether this extremely problematic chat was conducted using Signal accounts linked to the private telephone numbers of the officials involved. Tulsi Gabbard has declined to comment. DER SPIEGEL reporting has demonstrated, though, that privately used and publicly accessible telephone numbers belonging to her and Waltz are, in fact, linked to Signal accounts.

The U.S. newsmagazine The Atlantic revealed on Monday that Gabbard, Waltz and Hegseth, along with CIA Director John Ratcliffe and additional officials, discussed an imminent military strike against the Houthi militia in Yemen in a Signal chat. The information shared among the participants included intelligence information and precise attack plans. According to the Atlantic, Waltz added the editor-in-chief of the magazine, Jeffrey Goldberg, to the chat group. Precisely why he did so remains unclear.