The US Department of Defense is conducting an internal investigation into a "leak of national security information," but it did not specify what it was about.
A memo from Defense Secretary Pete Hegsett's chief of staff last night referred to a "recent unauthorized disclosure" of such information.
US President Donald Trump on Friday dismissed claims that his adviser Elon Musk would be briefed on how the US would hypothetically go to war with China.
If the investigation determines who is responsible for the unauthorized disclosure of information, criminal prosecution will follow, the memorandum states.
Homeland Security Secretary Kristi Noem promised this month to step up lie detector testing of staff to determine who might leak classified information to the media.
The Justice Department announced on Friday an investigation into "selective leaks of inaccurate, yet confidential, intelligence information" about the Venezuelan "Tren de Aragua" gang, whose members in the United States are being targeted by the Trump administration.
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