Standing above the city of Portland, Oregon, federal agents on the roof of an Immigration and Customs Enforcement building scan the crowd below where a few dozen protesters are gathered. The agents are not National Guard members. They’re the forces already tasked with securing the building.

But they are not enough for President Donald Trump. In his latest norm-breaking streak, Mr. Trump has used protests to justify involving the military in his fight against crime, illegal immigration, and what he calls an “invasion from within.”

Demonstrations at the Immigration and Customs Enforcement (ICE) field office in Portland have at times turned violent since June , but Mr. Trump on Sunday falsely claimed, “Portland is burning to the ground.” Officials in the Democratic stronghold say city pol

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