It's all they have, along with Russia, Russia, Russia. Never mind that, again, the Dems are the party of anti-Semites now, which has drawn in many White Supremacists because they also hate Jews.
And the isolationism thing because they believe he was/is trying to destroy NATO is just dumb. Sure Trump threatened NATO (I don't like the way he said it, but it got the desired results) but now they're stronger than ever.