The Foreign Emoluments clause of the U.S. Constitution — you might have skipped over it in social studies — says that no person holding any office of profit or trust can receive gifts from foreign powers. The idea was to prevent meddling in U.S. policy by other nations. Some scholars argue it doesn’t apply to the president, but presidents have certainly acted as if it does. And many scholars say it and statutes like it are a mine field for the future Trump Presidency.