The betting odds on Trump resigning or being impeached.
"According to Irish bookmaker Paddy Power, large sums have begun to be placed on Trump calling it quits, taking the odds into evens, the equivalent of 50 percent. While still not as strong as the odds on Trump being impeached, which currently stand at 4/6, or 60 percent, it still represents a significant shift. A similar move was also witnessed at leading British bookmaker Ladbrokes, which took its odds in from 11/10 to evens."
I'm not a gambler, but if I were, I would bet on him to tough it out.