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Donald Trump has yet again threatened to deploy the Act of Insurrection, legislation that authorizes the US president to utilize troops on domestic territory. This action is seen as a method to control the activation of the National Guard as the judiciary and governors in urban areas with Democratic leadership continue to stymie his initiatives.

Is this permissible, and what are the consequences? This is what to know about this centuries-old law.

What is the Insurrection Act?

The statute is a American law that gives the US president the power to utilize the troops or bring under federal control National Guard units inside the US to quell internal rebellions.

The law is often known as the Act of 1807, the time when Jefferson made it law. But, the current law is a amalgamation of laws passed between over several decades that outline the duties of the armed forces in domestic law enforcement.

Usually, federal military forces are prohibited from conducting civil policing against American citizens except in crises.

The act permits military personnel to engage in internal policing duties such as arresting individuals and conducting searches, tasks they are generally otherwise prohibited from performing.

A legal expert commented that national guard troops cannot legally engage in routine policing except if the president first invokes the Insurrection Act, which permits the utilization of military forces inside the US in the instance of an civil disturbance.

Such an action increases the danger that troops could end up using force while acting in a defensive capacity. Moreover, it could serve as a precursor to other, more aggressive troop deployments in the time ahead.

“No action these troops can perform that, for example police personnel against whom these protests have been directed themselves,” the commentator said.

Past Deployments of the Insurrection Act

The statute has been invoked on many instances. This and similar statutes were employed during the rights movement in the 1960s to protect activists and students integrating schools. The president deployed the airborne unit to Little Rock, Arkansas to shield students of color integrating Central high school after the state governor activated the national guard to block their entry.

After the 1960s, however, its application has become “exceedingly rare”, based on a analysis by the Congressional Research.

George HW Bush deployed the statute to respond to violence in LA in the early 90s after officers seen assaulting the Black motorist Rodney King were acquitted, leading to fatal unrest. The governor had sought armed assistance from the commander-in-chief to quell the violence.

What’s Trump’s track record with the Insurrection Act?

Trump threatened to invoke the statute in the summer when California governor challenged the administration to stop the deployment of armed units to support federal immigration enforcement in LA, describing it as an unlawful use.

During 2020, he asked state executives of multiple states to mobilize their National Guard units to the capital to control demonstrations that arose after Floyd was killed by a law enforcement agent. Several of the governors consented, sending troops to the capital district.

During that period, he also threatened to deploy the act for protests after Floyd’s death but ultimately refrained.

While campaigning for his next term, the candidate suggested that things would be different. The former president informed an audience in the state in 2023 that he had been prevented from deploying troops to quell disturbances in cities and states during his first term, and stated that if the situation occurred again in his second term, “I will not hesitate.”

The former president has also committed to deploy the national guard to help carry out his immigration objectives.

Trump said on Monday that to date it had not been necessary to use the act but that he would consider doing so.

“We have an Insurrection Act for a purpose,” Trump stated. “In case lives were lost and courts were holding us up, or executives were blocking efforts, certainly, I’d do that.”

Why is the Insurrection Act so controversial?

The nation has a strong American tradition of maintaining the national troops out of public life.

The framers, having witnessed misuse by the British military during colonial times, feared that giving the commander-in-chief total authority over armed units would undermine individual rights and the electoral process. According to the Constitution, governors usually have the right to keep peace within state territories.

These ideals are reflected in the Posse Comitatus Act, an 1878 law that usually restricted the armed forces from engaging in civil policing. This act serves as a legal exemption to the Posse Comitatus Act.

Advocacy groups have long warned that the Insurrection Act grants the president sweeping powers to deploy troops as a domestic police force in methods the founders did not envision.

Judicial Review of the Insurrection Act

The judiciary have been reluctant to question a president’s military declarations, and the ninth US circuit court of appeals commented that the commander’s action to deploy troops is entitled to a “significant judicial deference”.

Yet