President Donald Trump holds an Oval Office press conference to mark Elon Musk’s last day in his White House role. #foxbusiness #trump #elonmusk Subscribe to Fox Business! https://bit.ly/2D9Cdse Watch more Fox Business Video: https://video.foxbusiness.com Watch Fox Business Network Live: http://www.foxnewsgo.com/ FOX Business Network (FBN) is a financial news channel delivering real-time information across all platforms…