Trump recently announced he would leave control of his business empire “in total.” This comes at the heels of some excellent trolling by the Office of Government Ethics to pressure Trump. The emolument clause of the Constitution forbids foreign powers from offering gifts to the president. But curiously enough, it's not illegal for a sitting president to financially benefit from any of his activity in office. In other words, his arrangements with China, Saudi Arabia, DAPL and much more could be illegal. Or totally fine. We can't know. Especially when investigators are still trying to figure out where all of his business interest lie. There's no real precedent for this.