I wonder how much this risks raising the threat of nuclear war..
Trump probably thinks we can win a nuclear war.
Though that outcome is potentially far worse than a moderate MAD situation, where the world doesn't die but civilization and the ecosystem are alive albeit crippled for hundreds, if not thousands of years. In the former situation, I can see a "won" Trumpian nuclear war having the same ultimate results as the one at the end of the Turner Diaries. That is, a world that is heavily depopulated and the only civilization remaining are the "victors". All other civilizations and peoples have either been exterminated or have devolved into small bands of hunter-gatherer bands of mutated creatures that live in irradiated deserts that were once the cities, forests, and farmland of their ancestors.