Five things to know about Trump's legal power under the Insurrection Act

President TrumpDonald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE is threatening to deploy U.S. troops to states and cities that don’t crack down on destructive protests that have gripped the nation amid the uproar over the killing of an unarmed black man in police custody.

In order to send troops to police the streets, Trump would need to invoke an 1807 law known as the Insurrection Act, which authorizes the commander in chief to deploy active-duty troops within the United States to enforce federal or state laws under certain circumstances.

Here are five things to know about the statute.

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Trump enjoys broad discretion to dispatch troops under the law

The Insurrection Act allows presidents to deploy troops to hot spots across the country, a sort of carve-out to the general prohibition against using the military to enforce domestic laws.

Troops can be dispatched to cities and states at a governor's request. But the law also gives presidents the authority to do so on their own to enforce federal or state laws, protect civil rights, or quell “insurrection.”

“What it is is that the president can deploy federal troops if in his judgment there is domestic violence or unlawful gatherings that interfere with the execution of federal or state law,” said Elizabeth Goitein, co-director of the Brennan Center's Liberty and National Security Program.

Legal experts say political pushback and even court challenges could follow if Trump were to make such a move without a state’s invitation.

“The governors may challenge him in court, and he may pay at the ballot box,” said Thaddeus Hoffmeister, a law professor at the University of Dayton. “Arguably, a citizen who was directly impacted by the order may also bring an action in court against the order."

New York Attorney General Letitia James (D) tweeted that the state “will not hesitate to go to court to protect our constitutional rights during this time & well into the future.” New York has witnessed some of the most violent protests following the death of George Floyd, who was killed in Minneapolis police custody when a white police officer knelt on his neck for more than eight minutes.

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New York Gov. Andrew CuomoAndrew CuomoOvernight Health Care: Trump signs largely symbolic pre-existing conditions order amid lawsuit | White House puts off action on surprise medical bills | Rising coronavirus cases spark fears of harsh winter NY health officials to review any vaccine approved by Trump Americans splurging on Halloween candy MORE (D) said “thank you but no thank you” to the president’s suggestion he would dispatch the military.

However, the broad discretion Trump enjoys under the act likely puts him on firm legal footing.

“What I think [governors] could do was file a lawsuit arguing the president has overstepped those boundaries or misapplied the law,” said Elie Honig, a legal analyst and former federal prosecutor. “That is a serious uphill climb.”


Trump has to formally invoke it

Trump has threatened to deploy troops to U.S. cities and states if governors do not meet his demands to activate “sufficient numbers” of National Guardsmen to contain protests, but he hasn’t formally invoked the Insurrection Act.

“I have strongly recommended to every governor to deploy the National Guard in sufficient numbers that we dominate the streets. Mayors and governors must establish an overwhelming law enforcement presence until the violence has been quelled,” Trump said during a brief Rose Garden address Monday evening.

“If a city or a state refuses to take the actions that are necessary to defend the life and property of their residents, then I will deploy the United States military and quickly solve the problem for them,” the president continued.

Trump would need to issue a formal proclamation in order to dispatch troops, according to Stephen Vladeck, a University of Texas law professor. The president did not offer a timeline on potential decisions to deploy troops during Monday’s address.

The National Guard has already been activated in 28 states and Washington, D.C., and the Trump administration has put active-duty troops in the capital region on standby. On Monday evening, before he delivered his address, protesters were cleared from Lafayette Square across from the White House by law enforcement using tear gas ahead of a citywide 7 p.m. curfew.

“We are putting everybody on warning: Our 7 o’clock curfew will be strictly enforced,” Trump said. “Those who threaten innocent life and property will be arrested, detained and prosecuted to the fullest extent of the law.”


Military force against citizens

When confronting civil unrest, U.S. armed forces are bound by guidelines known as the Standing Rules for the Use of Force.

Those rules do not appear in the Insurrection Act. Rather, they’re developed on a case-by-case basis by the chairman of the Joint Chiefs of Staff, tailored to each domestic operation. For instance, when U.S. troops partner with a state’s national guard, use-of-force rules are crafted with that state’s laws in mind, according to a U.S. Army handbook for military lawyers.

Domestic rules of engagement tend to be stricter than those for overseas missions, though there is some overlap, such as permitting armed force only as a last resort, according to Mark Nevitt, a professor at the U.S. Naval Academy.

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That means if a U.S. military member were to adhere literally to Trump’s controversial invocation of the phrase “when the looting starts, the shooting starts,” Nevitt wrote, it would mark a clear violation of the rules.

“Using deadly force aggressively to stop looting clearly violates the governing rules for the use of force, principles of de-escalation, and the principles of using only minimum force, as a last resort,” Nevitt wrote for the national security outlet Just Security.

But the rules slacken in other contexts.

They do not limit force undertaken in self-defense, and they also allow more latitude for defending vital national security facilities, weapons sites or critical infrastructure, the Army handbook states.

“Military forces have fundamentally different training and mission than police,” Goitien said. “There’s a real risk that you’re going to see violent clashes with civilians increasing when you put soldiers into the scene.”

Active duty troops, unlike the National Guard and local police, are prohibited from engaging in domestic law enforcement activities except under very limited circumstances.


Rare use in history

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The law has been used in rare and extreme cases throughout U.S. history.

The Insurrection Act was invoked a number of times during the 1950s and 1960s to send troops to enforce federal civil rights law.

Former Presidents Eisenhower and Kennedy drew on it to enforce the racial desegregation of Southern schools after the Supreme Court’s 1954 decision in Brown v. Board of Education. The moves by Eisenhower and Kennedy came over the objections of state governors.

“Eisenhower sent troops to Little Rock [Ark.] and Kennedy to Mississippi, where they were not requested or welcome,” said Barbara McQuade, a law professor at the University of Michigan.

Most recently, it was invoked by former President George H.W. Bush in 1992 to quell riots in Los Angeles following the acquittal of police officers involved in the beating of Rodney King. At the time, Attorney General William BarrBill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE was serving his first stint atop the Justice Department.

The law, which has been amended a number of times, was revised in 2006 after Hurricane Katrina to allow for its use in a broader range of public safety situations, but those changes were repealed the following year.


Some Republicans have advocated for its use amid growing unrest

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A handful of Republicans have advocated for the use of the U.S. military to support local law enforcement in containing the unruly protests.

Sen. Tom CottonTom Bryant CottonThe Hill's 12:30 Report: Trump stokes fears over November election outcome The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Abortion stirs GOP tensions in Supreme Court fight MORE (R-Ark.) raised the idea of Trump invoking the Insurrection Act during an interview Monday morning on Fox News, hours before Trump delivered his Rose Garden address.

"The rioting, the anarchy and the looting ends tonight. If local law enforcement is overwhelmed ... let's see how these anarchists respond when the 101st Airborne is on the other side of the street,” Cotton said.

Trump later tweeted that Cotton’s remarks were “100% Correct.”

Sen. Marsha BlackburnMarsha BlackburnHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google Senate panel threatens subpoena for Google, Facebook and Twitter executives MORE (R-Tenn.) also tweeted that the president should “send in the troops” if “big city mayors can’t restore order.”

Democrats, meanwhile, have criticized the president’s rhetoric and actions, arguing Trump is contributing to the upheaval. Many have zeroed in on the decision to clear protesters in the nation’s capital with tear gas.

"We would hope that the president of the United States would follow the lead of so many other presidents before him to be a healer in chief and not a fanner of the flame," Speaker Nancy PelosiNancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) said in remarks Tuesday.