Images of boarded-up storefronts in major cities, including New York City and Washington, D.C., have given a dire premonition of what could come Tuesday night.

“I think it’s very sad and part of the reason is it’ll all be in Democrat cities, Democrat-run cities," Trump said in an interview with "Fox & Friends" Tuesday morning, giving New York City, Baltimore, Portland, Ore., Chicago and Oakland, Calif., as examples. "And that’s because of weak leadership. Their weak, weak leadership."

He also blamed left-wing extremists for being the source of the danger.