My knowledge of economics is even less than that of politics, but if the stock market were to tank again like it had in 2008, that could harm him big time. As for a foreign policy fiasco, I'd say North Korea is the leader in the clubhouse. I could be wrong, but it seems like Pyongyang had stepped up their missile testing since Trump took office, no doubt fueled by his macho man bluster against the Hermit Kingdom.