Elon Musk aides received accounts on a National Nuclear Security Administration system with tightly guarded nuclear secrets, ...

The plan to give him a top-secret briefing on China that day was scrapped after Trump learned about ... Former government ...

WASHINGTON—Top Pentagon aides were developing a briefing for Elon Musk last month on more than two dozen highly classified weapons programs for fighting China until the department’s top lawyer ...

A secret Russian satellite that US officials believe is linked to Russia’s nuclear weapons program appears to be spinning uncontrollably in space in a major blow for Moscow, according to ...

Top Pentagon aides were developing a briefing for Elon Musk last month on more than two dozen highly classified weapons programs for fighting China until the department’s top lawyer intervened, people ...