Steve Bannon calls for federal investigation into Musk after split with Trump

Steve Bannon on Friday called for the Trump administration to investigate Elon Musk, whose brewing feud with the president became public Thursday in a series of escalating tit-for-tat social media posts.

Bannon, a former White House chief strategist and an ally of President Trump, told CBS News that he wants the White House and Trump administration to probe alleged drug use by Musk, as well as the South African-native's immigration status. 

"They have to do that. You have to take his security clearance. Investigate drug use and investigate his involvement" with China, Bannon said in a phone interview. "And you have to investigate his status as a citizen."