President Donald Trump on Monday threatened to send the US military in states where the riots that several US cities continue to grow, citing a law has swept 213-year-old Insurrection Act of 1807, when its legal authority . “If a city or state refuses to take the measures that are necessary for life and property to defend its people, so I will use the US military and quickly solve the problem for them,” the president said on Monday night . It announced that already authorized thousands of troops to increase Washington in days in response to providing the city riots. Last week, the protests in response to the murder of George Floyd – a 46-year-old black man who was killed in custody by Minneapolis police on May 25 – the US has swept While most protests were peaceful some demonstrations. He grew violent, with the police turning rubber bullets and tear gas at the crowds and some protesters setting fire properties. Governors have activated in at least 23 states already have more than 17,000 members of the National Guard, according to the National Guard Bureau. The National Guard also has in addition to the troops in Washington, who arrived in the capital Monday night in use. Washington D.C., is a federal district, that is, the President has the power to station troops there, if you want. However, the troops in the rest of the US use of less simple. The Posse Comitatus Act of 1978 says American military law in the states and territories without the express consent of the Congress will prevail. But the Insurrection Act, which was passed by Congress and also the explicit permission is an exception, legal experts say TIME. “There is the tradition, the military will be used federal law enforcement or federal constitutional rights,” said Saikrishna Prakash, a professor of law at the University of Virginia Law School, he focuses his work on the executive. “But there is a long tradition in which in fact is already in use.” The Insurrection Act was to force several times during the desegregation movement for civil rights, called for example. Here’s what to know about the Insurrection Act and the power that gives the president. What is the Insurrection Act of 1807? Insurrection Act of 1807, power to the president of the National Guard or military execution of the laws in certain circumstances to unfold. It extended to the Militia Act of 1792, which gave the authority to the President government militias in case of rebellion or invasion “of a foreign nation or tribe.” The Insurrection Act can be invoked if there is a rebellion against the state law and a state government investigations claim support for the restoration, says Daniel Hulsebosch, a law professor at New York University School of Law, in the early history of law US specializes. It can also be called when there is a rebellion against the federal law Hulsebosch. It ‘important that, after the Civil War, Congress added a provision of the law allows the President to appoint, without government approval, if the state does not protect the constitutional rights of citizens. The president called on insurrection Act dozens of times in the course of US history, according to a report by the Congressional Research Service. It ‘been repeatedly forcing in mid-20th century, segregation and reacts invited disorders. For example, President Lyndon Johnson called for the law to use federal troops to Detroit, in response to the revolt of 1967. Use of fact made by 1960. The last time it was used was in 1992, during the riots in Los Angeles, in response to the acquittal of four white police officers who were accused of beating of black motorist Rodney King. (Some have the 1992 riots in the protests against police brutality that swept the country last week against.) In this case, California Governor Pete Wilson called for the deletion support of the riots government. But the law also called without the permission of the government in the past. called, for example, President Dwight Eisenhower law in 1957. In order to maintain the integration of Central High School, against the will of the governor of Arkansas, the 101st Airborne Division to Little Rock, Arkansas to post .. Can use Trump to quell the insurrection military troops to act for states to send protests? It can, says Prakash, although it must meet certain legal requirements. The Chairman may convene the Insurrection Act, if requested by a State help enforce state law, but so far no state has done so. He could invoke the law to enforce the federal law, but must first take an ad that disperse the law to order. If you do not disperse to do, then you can to go or military or National Guard and the state to suppress what he would support “unlawful obstructions, combinations or assemblages against the US authorities,” said Prakash. JB Pritzker has democratic governors of Illinois and Andrew Cuomo of New York already done – – If the troops a Governor Trump allow their country to send the president could still send troops if hindered supports the federal law, or ISN the State ‘ t to protect the rights of its citizens, says Prakash. If protests are peaceful, Prakash says that probably is no legal basis for the Insurrection Act to be. But reports that a small number of demonstrators committed arson looting and fires can be the basis for the invocation of the law could be the President says. The president could try to argue that States deny equal protection of the laws for the citizens whose property is stolen or burned, says Prakash. called President George H. Bush was also the Insurrection Act in 1989 in response to looting when it sent troops to the US Virgin Islands, after the sacking of the devastation following Hurricane Hugo broken after NPR. Current Attorney General Bill Barr was then Attorney General under President Bush. If President Trump called the Insurrection Act, the train would probably be challenged in court, says Prakash, who adds that it would not be surprised if “some district court said somewhere [movement] was illegal.” But in court Prakash, the call would probably be followed to the end. However, Prakash notes that, although the president eventually won the case an injunction could delay its troop deployment and the ability to limit governors troops to the current protests to be sent.