Trump's remarks followed a series of social media posts from Musk, the CEO of Tesla and SpaceX, who vowed late Friday to go to "war" to defend the visa program for foreign tech workers.

Sometimes you can be lonely even in a room full of people, so perhaps Trump needs the richest man in the world by his side to make him feel loved. But it's also possible that he senses his new best buddy is no longer as interested in him and has instead decided that he's going to play president without him.