In contrast, Rutgers University professor Bruce Afran says deploying military forces against Americans is “completely unconstitutional” in the absence of a true state of domestic insurrection. “There was an attack on ICE’s offices, the doorways, there was some graffiti, there were images of protesters breaking into a guardhouse, which was empty,” he says. “But even if it went to the point of setting a car on fire, that's not a domestic insurrection. That's a protest that is engaged in some illegality. And we have civil means to punish it without the armed forces.”

Afran argues that meddling with the expectations of civilians, who naturally anticipate interacting with police but not armed soldiers, can fundamentally alter the relationship between citizens and their government, even blurring the line between democracy and authoritarianism. “The long-term danger is that we come to accept the role of the army in regulating civilian protest instead of allowing local law enforcement to do the job,” he says. “And once we accept that new paradigm—to use a kind of BS word—the relationship between the citizen and the government is altered forever.”

“Violent rioters in Los Angeles, enabled by Democrat governor Gavin Newsom, have attacked American law enforcement, set cars on fire, and fueled lawless chaos," Abigail Jackson, a White House spokesperson, tells WIRED. "President Trump rightfully stepped in to protect federal law enforcement officers. When Democrat leaders refuse to protect American citizens, President Trump will always step in.”

As the orders to mobilize federal troops have come down, some users on social media have urged service members to consider the orders unlawful and refuse to obey—a move that legal experts say would be very difficult to pull off.

David Coombs, a lecturer in criminal procedure and military law at the University of Buffalo and a veteran of the US Army’s Judge Advocate General's Corps, says it’s hypothetically possible that troops could question whether Trump has the authority to mobilize state guardsmen over the objection of a state governor. “I think ultimately the answer to that will be yes,” he says. “But it is a gray area. When you look at the chain of command, it envisions the governor controlling all of these individuals.”

Separately, says Coombs, when troops are ordered to mobilize,...