Colo., told Morning Edition that "the risk of casualties goes up tremendously" if adversaries learn of military operations.

Republican and Democratic leaders on the Senate Armed Services Committee are requesting a formal investigation into the ...

Former Central Intelligence Agency Director John Brennan joins José Díaz-Balart on MSNBC and expresses concerns about the ...

Signal's founder and former CEO poked fun at the US military group-chat screwup even as officials expressed concerns about ...

The Atlantic on Wednesday published a transcript of text messages showing that Secretary of Defense Pete Hegseth detailed U.S ...

Here’s what to know about the protocol for government officials to communicate sensitive and classified information.

"If you're wondering whether or not this is a big deal, I can confirm that it is," said an advocate for military families.

The news of the leak of life-and-death operational details to a reporter lands differently with veterans and active-duty ...

Is the Signal messaging app really less secure than government systems? NBC News’ Kevin Collier explains Signal’s strengths ...

The White House doubled down Wednesday on its insistence that its top national security officials did nothing wrong when they ...

Senate Armed Services Committee Chair Roger Wicker (R-Miss.) and ranking member Jack Reed (D-R.I.) have sent a letter to the ...

The attorney general said the focus should be on the success of the U.S. military strike in Yemen, not that military ...