Donald Trump appeared to dismiss the idea of a phone call with Elon Musk this morning after their feud exploded in spectacular fashion yesterday, with the Tesla owner tearing into the US President on

Jacob Braun, the former acting principal deputy national cyber director, joins ABC News Live to address concerns over Elon Musk’s access to sensitive U.S. government information.

Joe Rogan suggested Elon Musk needs a social media break after he made the allegations against Trump, saying constant online arguments are "bad for your mental health."

President Donald Trump threatened to cut Elon Musk’s government contracts as their fractured alliance rapidly escalated into a public feud Thursday. Shares of Musk’s electric vehicle maker Tesla started dropping right as Trump launched into his criticism of his former adviser.

The worried reaction within space and national security agencies highlights the risks of government’s exclusive dependence on SpaceX for crucial tasks, including classified missions.

Elon Musk took to social media to respond to President Trump's criticism of his opposition to the Republican's spending bill. NBC News' Kelly O'Donnell reports from the White House on how the relationship between the president and billionaire could be straining over the "Big,