Top officials of U.S. President Donald Trump¡¯s administration mistakenly disclosed war plans in a messaging group that included a journalist shortly before the United States attacked Yemen¡¯s Iran-aligned Houthis, the White House said on Monday, following a first-hand account by The Atlantic.

Democratic lawmakers swiftly blasted the misstep saying it was a breach of U.S. national security and a violation of law that must be investigated by Congress.

The Atlantic¡¯s editor-in-chief, Jeffrey Goldberg, said in a report on Monday that he was unexpectedly invited on March 13 to an encrypted chat group on the Signal messaging app called the ¡°Houthi PC small group.¡± In the group, national security adviser Mike Waltz tasked his deputy Alex Wong with setting up a ¡°tiger team¡± to coordinate U.S. action against the Houthis.