The Pentagon’s internal watchdog notified the defense secretary of a probe into whether he shared classified information last month in a Signal group chat that included a journalist.

President Donald Trump confirmed that multiple employees within the National Security Council were fired Thursday, adding to National Security Advisor Mike Waltz's recent political woes that have snowballed since Democrats first slammed him over March's Signal chat leak.

A spokesperson for Denver Mayor Mike Johnston admitted this week that the office has been operating an internal group on the encrypted messaging app Signal that was monitoring news stories and had been auto-deleting the group's messages,

Illinois Gov. JB Pritzker asked the Joint Chiefs of Staff for assurances about steps being taken to protect national security after sensitive plans were shared on Signal.

Senior Trump administration officials have been accused of using the third-party app to discuss highly sensitive national security information.

The Pentagon's Inspector General's office announced on Thursday it was opening a probe into Defense Secretary Pete Hegseth's use of an unclassified commercial texting application to coordinate on the highly sensitive March 15 launch of U.

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,

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

Jeffrey Goldberg joins Ashley Parker to discuss breaking the Signal story, the fallout, and more. Don’t miss this subscriber-only event on Thursday, April 3, at 11:30 a.m. ET.