
There has been much speculation about former US President Donald Trump's intentions to declare martial law, particularly after his 2020 election loss. Trump and his supporters promoted the conspiracy theory that widespread electoral fraud occurred, and Trump himself claimed that his biggest mistake in 2020 was not declaring martial law. While the US Constitution does not explicitly define when a president can declare martial law, it also does not specifically forbid it. However, the US Supreme Court has ruled that martial law can only be declared in an active war zone, and there is no constitutional procedure for suspending certain amendments. Despite the lack of official confirmation, rumours and fabricated social media posts have fuelled concerns about Trump's potential invocation of the Insurrection Act of 1807, which grants the president the authority to deploy the military domestically in response to civil unrest.
| Characteristics | Values |
|---|---|
| Can Trump declare martial law? | No, Trump did not declare martial law. |
| Can a state governor declare martial law? | Yes, a state governor can declare martial law in their state. |
| Can the President of the United States declare martial law? | The U.S. Constitution does not explicitly grant the President this power, but some scholars argue that the Constitution's enumerated war powers of the legislative and executive branches give both Congress and the President this authority. |
| Can the President deploy the military domestically? | Yes, the President can deploy the military domestically to perform law enforcement functions. |
| Can the President invoke the Insurrection Act? | Yes, the President can invoke the Insurrection Act to call on the military to enforce civilian law. |
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What You'll Learn

Martial law and the Insurrection Act
Rumours have been spreading online that former US President Donald Trump will declare martial law. These rumours appear to be based on an executive order signed by Trump on Inauguration Day, 20 January 2025. The order required the Secretary of Defence and the Secretary of Homeland Security to submit a report on the situation at the US-Mexico border and whether to invoke the Insurrection Act of 1807. The deadline for this report was 20 April 2025.
The Insurrection Act is a set of federal laws dating back to the early 19th century. It grants the president the authority to deploy the US military or National Guard forces domestically to suppress rebellions, civil unrest, or obstruction of federal law. The Act has been used sparingly throughout history.
Martial law refers to the replacement of civilian government by military rule and the suspension of civilian legal processes for military powers. While the term "martial law" has no established definition, it is generally understood as a power that allows the military to assume the role of civilian government in an emergency. Importantly, the Insurrection Act does not authorise martial law. Instead, it permits the military to assist civilian authorities, not take their place. Under current law, the president has no authority to declare martial law.
Despite the rumours, there is no credible evidence or reporting that martial law is being considered anywhere in the US. Trump himself responded to the rumours on Twitter, stating, "Martial law = Fake News. Just more knowingly bad reporting!"
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Trump's supporters' calls for martial law
In the aftermath of the 2020 election loss, Trump and his supporters promoted the conspiracy theory that widespread electoral fraud occurred during the election, asserting, without evidence, that Trump was the winner. This movement was called "Stop the Steal". Trump continued to insist that he won the 2020 election, and during his public speeches, he claimed that massive election fraud caused his loss. Trump's supporters, including Michael Flynn, Sidney Powell, and L. Lin Wood, suggested that Trump could suspend the Constitution, declare martial law, and rerun the election. Trump's supporters' calls for martial law were also met with horror by many retired military officers, attorneys, and other commentators.
Trump himself has stated that one of his biggest mistakes in 2020 was not declaring martial law, despite the advice of his generals. While some scholars argue that the Constitution's enumerated war powers give both Congress and the President the power to declare martial law, the Constitution does not explicitly grant the President this power. The Posse Comitatus Act, passed in 1878, further prevents the US military from engaging in civilian law enforcement activities, strengthening the separation of powers between Congress and the President. While the president can call on the military to help local governments after natural disasters, their help is usually limited.
Speculation is swirling online that the president will invoke martial law, which some social media users appear to be conflating with the Insurrection Act. The Insurrection Act has the powers to override the Posse Comitatus Act, which is normally in place at all times, and prohibits the US military from participating or interfering in any civil law enforcement. It also gives the US President - the commander-in-chief of the US armed forces - complete powers to decide if, when, and where to deploy US troops within the United States of America. The Insurrection Act, however, is somewhat different from a martial law declaration. While martial law gives complete control of administration and running of the state's affairs to a military general, the Insurrection Act keeps the powers of the state and administration with the US President, who selectively uses military powers to enforce law and order.
There has been no credible indication or reporting that the US administration is preparing to initiate martial law or that any military mobilization is planned. The order with the April 20 deadline is explicitly focused on "operational control of the southern border," not on broader civil or domestic unrest.
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Trump's ability to declare martial law
In the United States, martial law may be declared by the President or a State governor. The Constitution does not explicitly grant the president the power to declare martial law. However, scholars argue that the Constitution's enumerated war powers give both Congress and the president the power to declare martial law. Articles I and II of the Constitution give each branch some control over America's military forces.
When martial law is declared, the military takes over the responsibility of governing from the civil government to restore order in a time of crisis. This means that many civil liberties can be suspended, such as freedom of movement, freedom of speech, and protection from unreasonable searches. Curfews can also be implemented.
There has been speculation that President Trump would declare martial law, stemming from an executive order he signed on his first day in office, which hinted at the possibility of such steps within 90 days. This order included a provision suggesting that President Trump might "invoke the Insurrection Act of 1807" and deploy the military within the United States. However, it is important to note that the Insurrection Act merely authorizes the military to support civilian authorities without replacing them, whereas martial law enables the military to assume the role of the civilian government.
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The US federal government and martial law
The US Constitution does not explicitly grant the President the power to declare martial law. However, scholars argue that the Constitution's enumerated war powers give both Congress and the President the authority to declare martial law. Articles I and II of the Constitution grant each branch some control over the country's military forces. Article II, Section 2, designates the President as the Commander-in-Chief of the Army, Navy, and state militias.
The Posse Comitatus Act and other statutes, such as the Insurrection Act of 1807, regulate the domestic use of the military and limit the President's ability to federalize National Guard troops for martial law purposes. The Insurrection Act authorizes the military to support civilian authorities without replacing them, while martial law enables the military to assume control from civilian governments during a crisis.
Historically, martial law has been declared by state officials in response to violent civil unrest, natural disasters, or to break labor strikes. For example, in 1900, martial law was declared during the Akron Riot and the Galveston hurricane. In 1903, Colorado Governor James Peabody declared martial law in Cripple Creek and Telluride to break a peaceful strike by the Western Federation of Miners. In 1914, the imposition of martial law climaxed during the Colorado Coalfield War, resulting in the Ludlow Massacre. In 1934, California Governor Frank Merriam placed the docks of San Francisco under martial law due to "riots and tumult" caused by a dock worker's strike.
During times of war, rebellion, or natural disaster, martial law involves the temporary substitution of military authority for civilian rule. When martial law is in effect, the military commander of an area assumes virtually unlimited authority to make and enforce laws, suspend existing laws, and supersede civil authority and the ordinary administration of justice. However, civilians may not be tried by military tribunals as long as civilian courts are functional.
In summary, while the US Constitution does not explicitly grant the President the power to declare martial law, it gives both Congress and the President some control over the military. The President's ability to declare martial law is further limited by statutes such as the Posse Comitatus Act and the Insurrection Act. Historically, martial law has been declared by state officials in response to civil unrest, natural disasters, or labor strikes, and it involves the temporary substitution of military authority for civilian rule during times of crisis.
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Martial law and the suspension of civil law
Martial law is a "dramatic departure from normal practice in the United States." It involves the suspension of civil law and the assumption of governance by the military. When federal or state governments declare martial law, they suspend all local laws, civil authority, and sometimes local judiciaries. In their place, the commanding officer enacts temporary laws and military tribunals. This gives the military commander virtually unlimited authority to govern an area.
In the United States, the Constitution does not explicitly grant the president the power to declare martial law. However, scholars argue that the Constitution's enumerated war powers of the legislative and executive branches give both Congress and the president the ability to declare martial law. Articles I and II of the Constitution grant each branch some control over the country's military forces. Article II, Section 2, designates the president as the Commander-in-Chief of the Army, Navy, and state militias.
Historically, martial law has been imposed in the United States during periods of civil disorder, such as the Colorado Coalfield War in 1914, and in response to specific incidents, such as the Minnesota Governor's declaration of martial law in Minneapolis in 1934 due to escalating violence. It has also been used in post-war reconstruction, such as in Germany and Japan after World War II, and in the former Confederate States of America after the American Civil War.
In recent times, there has been speculation about former President Donald Trump's potential invocation of the Insurrection Act of 1807 and the imposition of martial law. However, as of April 2025, this has not occurred.
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Frequently asked questions
Martial law in the United States may be declared by proclamation of the President or a State governor. The Constitution does not explicitly grant the president the power to declare martial law, but scholars argue that the Constitution's enumerated war powers give both Congress and the president the power to declare martial law.
Martial law enables the military to assume the role of the civilian government during a crisis. When martial law is declared, the military takes over the responsibility of governing, and many civil liberties can be suspended, such as freedom of movement, freedom of speech, and protection from unreasonable searches.
There were speculations that President Donald Trump would declare martial law on April 20, 2025, by revoking the Insurrection Act of 1807. However, there is no evidence that he did.


















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