An airplane was about to crash...

 An airplane was about to crash. There were 4 passengers on board, but only 3 parachutes.
The 1st passenger said, 'I am Steph Curry, the best NBA basketball player. The Warriors and my millions of fans need me, and I can't afford to die.' So he took the 1st pack and left the plane.
The 2nd passenger, Donald Trump, said, 'I am the president of the United States, and I am the smartest President in American history, so my people don't want me to die.' He took the 2nd pack and jumped out of the plane.
The 3rd passenger, the Pope, said to the 4th passenger, a 10-year-old schoolboy, 'My son, I am old and don't have many years left, you have more years ahead so I will sacrifice my life and let you have the last parachute.'
The little boy said, 'That's okay, Your Holiness, there's a parachute left for you. America 's smartest President took my schoolbag.

This is another airplane joke. It is also a Trump joke as well. The humor in the joke lies in the fact that Donald Trump - the self proclaimed "smartest president" took a schoolbag thinking that it was a parachute, and presumably jumped to his death. The juxtaposition of having someone declare themselves to be the smartest person, and then mistaking a school bag for a parachute is where the humor comes from.

Honestly I have heard this joke before, and the 2nd passenger is usually swapped out to be whoever the jokester doesn't like, so this is a pretty stale joke. That being said, I could imagine Trump declaring himself to be the smartest president in US history, so it really does fit him.

It is pretty funny.