President Donald Trump was startled by Elon Musk's behavior after he joined him on stage last year at a campaign rally in Butler, Pennsylvania, according to a new book. The tech mogul, 53, jumped up and down and waved his arm's triumphantly in the air at the political event,

On Monday, thousands of protesters across the country hit the streets to tell Donald Trump and Elon Musk “No kings on Presidents’ Day” in response to the barrage of alarming actions—from legally questionable executive orders to mass firings —taken by the administration since the inauguration.