When the editor-in-chief of the Atlantic, Jeffrey Goldberg, was added to a group chat of the most senior politicians in the United States discussing a bombing mission in Yemen, one of the questions to arise was why they were using Signal, which is not approved by the US government for sharing such sensitive information.
With Signalgate having dominated a turbulent week in US politics, here is everything you need to know about the app at the centre of the scandal.
