Go around it any way you want, however if Americans are hit first, they would do exactly what Trump said. If let say, China was hit first they would do the same thing, as would Russia, in both cases the enemy here at least in the past was the U.S. Then we have Israel and Iran. Israel has never acknowledged that they have nuclear weapons, but it has always been assumed they have. The difference here is Israel will never allow it itself to be in a position to be hit first, and will take a pre emptive strike.