Roast
When you take office and run the show, you need to be able to take a few jokes and laugh at yourself. That is the entire point of the White House Correspondents Association Dinner, a tradition that goes back many decades. All the press and comedians are invited to talk about and roast the man in charge.
The spirit of the dinner is to promote free speech and to show that in the United States of America, you can make fun of your leaders. There are many countries around the world where people are afraid to poke fun at the people in charge, which is why this is usually done in a playful spirit.