Trump's Insurrection Act threat stands out against the law's long history

ATLANTA — Donald Trump would not be the first president to invoke the Insurrection Act, as he has threatened, so that he can send U.S. military forces to Minnesota.

But he'd be the only commander in chief to use the 19th-century law to send troops to quell protests that started because of federal officers the president already has sent to the area — one of whom shot and killed a U.S. citizen.

The law, which allows presidents to use the military domestically, has been invoked on more than two dozen occasions — but rarely since the 20th Century's Civil Rights Movement.

Federal forces typically are called to quell widespread violence that has broken out on the local level — before Washington's involvement and when local authorities ask for help. When presidents acted without local requests, it was usually to enforce the rights of individuals who were being threatened or not protected by state and local governments. A third scenario is an outright insurrection — like the Confederacy during the Civil War.

Experts in constitutional and military law say none of that applies in Minneapolis.

''This would be a flagrant abuse of the Insurrection Act in a way that we've never seen,'' said Joseph Nunn, an attorney at the Brennan Center for Justice's Liberty and National Security Program. ''None of the criteria have been met.''

Here is a look at the law, how it's been used and comparisons to Minneapolis.

George Washington signed the first version in 1792, authorizing him to mobilize state militias — National Guard forerunners — when ''laws of the United States shall be opposed, or the execution thereof obstructed.''

He and John Adams used it to quash citizen uprisings against taxes, including liquor levies and property taxes that were deemed essential to the young republic's survival.

Congress expanded the law in 1807, restating presidential authority to counter ''insurrection or obstruction'' of laws. Nunn said the early statutes recognized a fundamental ''Anglo-American tradition against military intervention in civilian affairs'' except ''as a tool of last resort.''

Trump insists conditions call for the last resort

The president argues Minnesota officials and citizens are impeding U.S. law by protesting his agenda and the presence of U.S. Immigration and Customs Enforcement officers and Customs and Border Protection officers. Yet early statutes also defined circumstances for the law as unrest ''too powerful to be suppressed by the ordinary course'' of law enforcement.

''ICE has the legal authority to enforce federal immigration laws,'' Nunn said. ''But what they're doing is a sort of lawless, violent behavior'' that goes beyond their legal function and ''foments the situation'' Trump wants to suppress.

''They can't intentionally create a crisis, then turn around to do a crackdown,'' he said, adding that the Constitutional requirement for a president to ''faithfully execute the laws'' means Trump must wield his power, on immigration and the Insurrection Act, ''in good faith.''

Civil War-era changes were for Union interests and civil rights protections

Courts have blocked some of Trump's efforts to deploy the National Guard, but he'd argue with the Insurrection Act that he does not need a state's permission to send troops.

That traces to President Abraham Lincoln, who held in 1861 that Southern states could not legitimately secede. So, he convinced Congress to give him express power to deploy U.S. troops, without asking, into Confederate states he contended were still in the Union. Quite literally, Lincoln used the act as a legal basis to fight the Civil War.

Workers, immigrants were at the heart of some deployments

During post-war industrialization, violence erupted around strikes and expanding immigration — and governors sought help.

President Rutherford B. Hayes granted state requests during the Great Railroad Strike of 1877 after striking workers, state forces and local police clashed, leading to dozens of deaths. Grover Cleveland granted a Washington governor's request to help protect Chinese citizens who were being attacked by white rioters. President Woodrow Wilson sent troops to Colorado in 1914 amid a coal strike after workers were killed.

Federal troops helped diffuse each situation.

On 20th century civil rights, a repeat of the Reconstruction approach

Franklin Roosevelt dispatched 6,000 troops to Detroit — more than double the U.S. forces in Minneapolis — after race riots that started with whites attacking Black residents. State officials asked for FDR's aid after riots escalated, in part, Nunn said, because white local law enforcement joined in violence against Black residents. Federal troops calmed the city after dozens of deaths, including 17 Black residents killed by local police.

Once the Civil Rights Movement began, presidents sent authorities to Southern states without requests or permission, because local authorities defied U.S. civil rights law and fomented violence themselves.

Dwight Eisenhower enforced integration at Central High School in Little Rock, Arkansas. John F. Kennedy sent troops to the University of Mississippi after riots over James Meredith's admission and then pre-emptively to ensure no violence upon George Wallace's ''Stand in the Schoolhouse Door'' to protest the University of Alabama's integration.

''There could have been significant loss of life from the rioters'' in Mississippi, Nunn said.

Lyndon Johnson protected the 1965 Voting Rights March from Selma to Montgomery after Wallace's troopers attacked marchers' on their first peaceful attempt.

Johnson also sent troops to multiple U.S. cities in 1967 and 1968 after clashes between residents and police escalated. The same thing happened in Los Angeles in 1992, the last time the Insurrection Act was invoked.

Riots erupted after a jury failed to convict four white police officers of excessive use of force despite video showing them beating a Rodney King, a Black man. California Gov. Pete Wilson asked President George H.W. Bush for support.