From Sky News just in
White House press secretary tries to play down security breach as she attacks journalist
Karoline Leavitt, the White House press secretary, has been reacting to the leak in the past few minutes on X.
She claims the journalist who was mistakenly added to the Signal chat - Jeffrey Goldberg - is "well-known for his sensationalist spin".
She adds: "Here are the facts about his latest story:
"1. No "war plans" were discussed.
"2. No classified material was sent to the thread.
"3. The White House Counsel's Office has provided guidance on a number of different platforms for President Trump's top officials to communicate as safely and efficiently as possible.
"As the National Security Council stated, the White House is looking into how Goldberg's number was inadvertently added to the thread.
"Thanks to the strong and decisive leadership of President Trump, and everyone in the group, the Houthi strikes were successful and effective.
"Terrorists were killed and that's what matters most to President Trump."
Despite her claims, a US government memo suggested earlier today Signal was not an approved chat service for officials.
And you may well draw your own conclusions about whether "war plans" were discussed.