Kara Sears
The US Constitution does not define martial law or specify who can declare it. While the Supreme Court has held that states can declare martial law, it has never explicitly ruled that the president can. In the past, several presidents have imposed martial law, but there is no indication that the US government is preparing to initiate it now. In 2025, rumours circulated that President Donald Trump would declare martial law on April 20, but these were unfounded. Trump's executive order on January 20, 2025, did, however, state that within 90 days, the Secretary of Defence and the Secretary of Homeland Security would submit a joint report on the situation at the US-Mexico border and recommend additional actions to obtain complete operational control, including whether to invoke the Insurrection Act of 1807.
| Characteristics | Values |
|---|---|
| Can Trump impose martial law? | It is unclear whether Trump can impose martial law. The Constitution does not define or specify who can declare it. However, several presidents and state governors have imposed or approved declarations of martial law throughout American history. |
| What is martial law? | Martial law refers to instances when a nation's armed forces assume the governance of an area. It occurs when the army takes over a civilian area and imposes its own rules. |
| What is the Insurrection Act? | The Insurrection Act of 1807 gives the president the authority to deploy the military or armed forces in the U.S. and use them against Americans under certain conditions. It ensures civilian control persists, even when armed forces are deployed. |
| What is the difference between martial law and the Insurrection Act? | Martial law gives complete control of administration to a military general. The Insurrection Act keeps powers with the president, who selectively uses military powers to enforce law and order. |
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What You'll Learn
Martial law in the US
The US Constitution does not define martial law, nor does it specify who can declare it. While the Supreme Court has held that states can declare martial law, it has never explicitly ruled that the president can. Thus, it is unclear whether the president can legally declare martial law. However, several presidents throughout history have imposed or approved declarations of martial law.
Martial law refers to instances when a nation's armed forces assume the governance of an area, typically when civilian authority has ceased to function due to insurrection, natural disaster, or other reasons. It constitutes a total delegation of power to military control, with local laws, civil authority, and sometimes local judiciaries being suspended. In the United States, martial law has been imposed at least 68 times, mostly in limited, local areas. Notable instances include the Battle of New Orleans, the Great Chicago Fire of 1871, the San Francisco earthquake of 1906, the Omaha race riot of 1919, and during the Civil Rights Movement.
The Insurrection Act of 1807 grants the president the authority to deploy the military or armed forces within the United States and use them against Americans under specific conditions, such as rebellions, civil unrest, or obstruction of federal law. While legally distinct from martial law, the two terms are often conflated in popular discourse. In January 2025, President Donald Trump issued an executive order proclaiming a national emergency regarding the US-Mexico border, leading to speculation that his administration might invoke the Insurrection Act. However, there is no credible evidence that martial law is being considered, and the administration's order is explicitly focused on operational control of the southern border.
Some scholars argue that the president has the executive power to declare martial law, while others contend that congressional authorization is necessary. According to the Posse Comitatus Act, it is unlawful for federal military forces to engage in civilian law enforcement without congressional approval. Therefore, Congress may be the only governmental branch that can legally declare martial law, restricting the president's ability to act independently.
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The Constitution and martial law
The US Constitution does not define martial law, nor does it specify who can declare it. It also does not explicitly grant the president the power to declare martial law. While the Supreme Court has held that states can declare martial law, it has never specifically ruled that the president can. Therefore, it is unclear whether the president can legally declare martial law.
However, several presidents throughout history have declared martial law. According to a modern interpretation, the president and state officials can declare "degrees of martial law in specific circumstances." Some scholars believe the president has the executive power to declare martial law, while others believe the president needs congressional authorization to impose it in a civilian area.
Congress has placed clear and wide-ranging restrictions on the president's ability to use the military domestically. A presidential declaration of martial law would violate these rules. The Constitution gives most of the relevant authority to Congress. Therefore, the president would not have the constitutional authority to override these restrictions, and a unilateral declaration of martial law would not survive a legal challenge.
While there is no federal statute that authorizes the president to declare martial law, Congress has passed laws related to domestic military deployment that grant the president considerable authority to use troops domestically in ways short of martial law. The Insurrection Act, for example, allows the president to deploy the military to assist civilian authorities with law enforcement activities. However, this does not give the president the power to declare martial law, as civilian control persists even when armed forces are deployed on the ground.
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Instances of martial law in US history
The US Constitution does not define martial law, nor does it specify who can declare it. However, the US President and Congress have the power to impose martial law, and almost all state constitutions allow the state governor or legislature to impose it as well.
Boston, 1774:
The British Parliament passed the Intolerable Acts, effectively placing Boston under martial law by closing its port and restricting town meetings. General Thomas Gage, the military governor, enforced these measures to suppress colonial resistance and maintain control.
Virginia, 1775:
Lord Dunmore, the royal governor of Virginia, issued a proclamation declaring martial law and offering freedom to indentured servants and enslaved individuals who joined British forces against the rebelling colonists.
New Orleans during the Battle of New Orleans:
Martial law was imposed in New Orleans during the Battle of New Orleans, but the specific details of this event are not readily available.
Great Chicago Fire of 1871:
Chicago mayor Roswell B. Mason declared a state of martial law and placed General Philip Sheridan in charge of the city on October 9, 1871, following the Great Chicago Fire.
Omaha Race Riot of 1919:
Local leaders declared martial law to protect themselves from mob violence during the Omaha race riot in 1919.
Lexington Riots of 1920:
Similar to the Omaha race riot, martial law was declared during the Lexington riots of 1920 to protect against mob violence.
West Coast Waterfront Strike of 1934:
Martial law was declared during the 1934 West Coast waterfront strike, likely to maintain control and suppress any potential riots or civil unrest.
Oklahoma, 1930s:
Governor William "Alfalfa Bill" Murray declared martial law at least 6 times and possibly more than 30 times during his tenure in the 1930s.
It is important to note that the power to declare martial law is not explicitly granted to the US President by the Constitution, and the Supreme Court has never specifically ruled that the President can do so. The lack of a clear definition and the absence of explicit authority in the Constitution contribute to the uncertainty and elusiveness of martial law as a legal entity in the United States.
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The Insurrection Act of 1807
In January 2025, President Donald Trump signed an executive order requiring the Secretary of Defense and the Secretary of Homeland Security to submit a joint report on the southern border within 90 days, including any recommendations for additional actions. This executive order specifically mentioned the potential invocation of the Insurrection Act of 1807, sparking widespread speculation and concern about the possibility of martial law being declared.
It is important to note that the Insurrection Act and martial law are distinct concepts. While the Insurrection Act allows for military intervention, it does not dissolve civilian institutions or grant the military direct control. In contrast, martial law involves the armed forces assuming governance and suspending constitutional freedoms.
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Trump's executive order
On January 20, 2025, US President Donald Trump issued a key executive order, proclaiming a national emergency on the US-Mexico border. The order also included a rider that required the Secretary of Defence and the Secretary of Homeland Security to submit a joint report to the President within 90 days, recommending additional actions that may be necessary to obtain complete operational control of the southern border, including whether to invoke the Insurrection Act of 1807.
The Insurrection Act of 1807 gives the President the authority to deploy the US military and the National Guard domestically and use them against Americans under certain conditions. It also overrides the Posse Comitatus Act, which prohibits the US military from participating or interfering in any civil law enforcement. However, the Insurrection Act is different from martial law, as the latter gives complete control of administration to a military general, while the former keeps the powers of the state and administration with the President.
While the US Constitution does not explicitly grant the President the power to declare martial law, several presidents throughout history have done so. Additionally, almost all state constitutions allow the state governor or legislature to impose martial law. As of April 15, 2025, with the approaching deadline of the 90-day period mentioned in the executive order, there is widespread speculation that President Trump might use the Insurrection Act, particularly to achieve his stated objective of total southern border control.
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Frequently asked questions
There is no evidence that Trump will impose martial law. However, the Constitution does not explicitly grant the president the power to declare martial law, and the Supreme Court has never specifically ruled that the president can.
Martial law refers to when the military temporarily substitutes its authority in place of civilian authority. It occurs when the army takes over a civilian area and imposes its own rules.
Yes, throughout history, martial law has been imposed at least 68 times in limited, usually local areas of the United States. It has been declared by state and federal authorities, but not by a president since the Civil War.
The Insurrection Act of 1807 gives the president the authority to deploy the US military and use it against citizens under certain conditions. It has been invoked rarely and is considered dangerously overbroad.
