WASHINGTON—Secretary of State Marco Rubio has been thrown into two top national security jobs at once as President Donald Trump presses forward with his top-to-bottom revamp of US foreign policy, ...

SpaceX, however, has to maintain a drug-free workspace in order to keep its government contracts and drug tests workers.

Musk said this week that he’s leaving his job as a senior adviser, an announcement that came after he revealed his plan to ...

As Musk entered President Donald Trump’s orbit, his private life grew increasingly tumultuous and his drug use was more ...