Like many previous presidents, he golfs. And like all presidents who golf, when he hits the green, he is accompanied by Secret Service agents. The agents use golf carts to get around the courses. And to get their hands on the golf carts, they need to rent them from the golf courses at which the president plays. All of this is fundamentally normal -- except for the fact that Trump golfs at courses he owns. So when the Secret Service spends $35,000 on Mar-a-Lago golf cart rentals, it's not just a normal security expense -- Trump is personally profiting from his own protection.