It's been blasted as one of the most "stunning and dangerous" breaches of military intelligence ever seen. Senior Trump officials set up a group chat to discuss top secret Yemen war plans. But they accidentally looped in a journalist. The National Security Council says it's investigating, but the breach has sparked widespread outrage over how classified information is being handled. So what have we learned? What was leaked to the journalist? The chat, named "Houthi PC Small Group", was set up on the Signal messaging app on March 13. It appeared to include cabinet secretaries and top aides, including Vice-President...