Trump's foreign policies have yet to be enacted. But having said that, it's doubtful they'll be any better or worse for democracy than all the others over the last 150 years.

America's foreign policy isn't predicated on whether a foreign government is democratic, but on it's amenability to US commercial and strategic interests. Whether it's democratic or totalitarian, the USA will topple a foreign government that isn't sufficiently friendly to those interests. Likewise, the USA will tolerate the worst abuses by a foreign government that plays ball with Washington.