The top Republican and Democrat on the Senate Armed Services Committee are requesting an investigation into how Trump national security officials used the Signal app to discuss military strikes. Thursday's request ensures some bipartisan scrutiny on an episode President Donald Trump has dismissed as frivolous. Republican committee chair Sen. Roger Wicker and top Democrat Sen. Jack Reed signed onto a letter to the acting inspector general at the Defense Department for an inquiry into the potential use of unclassified networks to discuss classified information. Contents of the Signal chat published by The Atlantic show Defense Secretary Pete Hegseth listed weapons systems and a timeline for an attack on Iran-backed Houthi rebels in Yemen.

Top national security officials for President Donald Trump, including his defense secretary, texted war plans for upcoming military strikes in Yemen to a group chat in a secure messaging app that included the editor-in-chief for The Atlantic. This was reported by the magazine in a story posted online Monday. The National Security Council said the text chain "appears to be authentic." Atlantic editor-in-chief Jeffrey Goldberg said the material in the text chain "contained operational details of forthcoming strikes on Iran-backed Houthi-rebels in Yemen, including information about targets, weapons the U.S. would be deploying, and attack sequencing." Just two hours after Goldberg received the details of the attack on March 15, the U.S. began launching a series of airstrikes.

White House national security spokesman John Kirby says President Joe Biden is "deeply concerned" about the unauthorized release of classified documents on Israel's preparation for a potential retaliatory attack on Iran. Kirby said Monday that the administration still isn't certain if the classified information was leaked or hacked. Kirby says administration officials "don't have any indication at this point that there's an expectation that there'll be additional documents like this finding their way into the public domain." He added that the Pentagon is investigating. The investigation may take some time as authorities look for digital or physical clues that could reveal how the information got out.