It’s a more extensive use of the app than previously reported and sheds new light on how commonly the Trump administration’s national security team relies on Signal.

The team led by U.S. President Donald Trump's national security adviser, Mike Waltz, set up at least 20 group chats on the commercial Signal app to coordinate official work on issues involving China,

Amid the backlash to the Trump administration’s use of the private messaging app Signal for sensitive U.S. military planning in Yemen, Politico reported Wednesday that national security adviser Mike Waltz’s team set up at least 20 such chats.

The inquiry will examine whether the Pentagon chief violated the agency’s standards for sharing classified information.

The senior Republican and Democrat on the Senate Armed Services committee requested the probe after Hegseth disclosed sensitive on Signal.

The inspector general review follows revelations that top Trump officials used the unclassified platform Signal to coordinate military strikes in Yemen.