President Trump and the first lady danced to "My Way" at the Liberty Ball.
Veteran limo driver Luis Villarroel said when he asked to protesters to stop banging on his car, they turned on him and objects rained down.
217 people were arrested and six police officers suffered minor injuries after some protesters set fires and smashed windows in the nation's capital.
The operation, especially in the post-9/11 era, is the most sophisticated protection and communications system in the world.
"As you looked into his eyes you could see the surprise, you could see the shock, and ...you could actually see the fear," a federal agent said.