Alien Enemies Act of 1798: History, Powers and Status

Most laws fade into dusty irrelevance. The Alien Enemies Act of 1798 did not get that memo. Passed in the heat of a quasi-war with France, this statute gave the president extraordinary powers to lock up or kick out foreigners deemed enemies—and it’s still sitting in the U.S. Code more than two centuries later. Now, with a 2025 invocation targeting alleged gang members as an “invasion,” courts are wrestling with what this relic means for due process and constitutional limits.

Enacted Date: July 6, 1798 · Current Status: Remains in force · Presidential Power: Detention and deportation in wartime · Part of Acts: Alien and Sedition Acts · Recent Use: Reported by Trump Administration

The following key facts establish the basic parameters of this contested statute.

These specifications reveal how a 226-year-old statute became central to modern immigration enforcement debates.

What is the Alien Enemies Act of 1798?

The Alien Enemies Act, officially titled “An Act respecting alien enemies,” is a federal statute that authorizes the President to apprehend, restrain, secure, and remove non-citizens who are natives, citizens, denizens, or subjects of a hostile nation during wartime, invasion, or predatory incursion. Enacted on July 6, 1798, it remains codified at 50 U.S.C. §§ 21–24—the only surviving provision from the broader Alien and Sedition Acts of that year.

Full text and provisions

The Act grants sweeping authority: the President may order the removal of “alien enemies” without prior notice or hearing, based solely on their nationality or citizenship status. The National Archives holds the original texts of these acts, showing Congress enacted the statute pursuant to its war powers to declare war, raise armies, and suppress insurrections (National Archives). Critically, the Act permits targeting individuals without an individualized hearing, raising serious due process and equal protection concerns (Brennan Center).

Relation to Alien and Sedition Acts

The Alien Enemies Act was one of four laws passed in 1798 collectively known as the Alien and Sedition Acts. Unlike its companion statutes—including the Alien Friends Act of June 25, 1798, which authorized the President to remove “aliens of the United States” deemed dangerous to peace and safety—the Alien Enemies Act focused specifically on nationals of enemy nations during wartime and has never been repealed. James Madison called the related Alien Friends Act “a monster that must for ever disgrace its parents” (Supreme Court Opinion). While the Alien Friends Act lapsed in 1801, the Alien Enemies Act endures in federal law.

What was the main purpose of the Alien and Sedition Acts 1798?

The Alien and Sedition Acts were enacted amid the Quasi-War with France (1798–1800), an undeclared naval conflict that saw French warships preying on American merchant vessels. Federalists in Congress, fearing both foreign interference and domestic dissent, pushed through four bills that together restricted speech critical of the government and expanded executive power over foreigners.

Context of Quasi-War with France

Tensions between the United States and Revolutionary France had escalated to the point where French privateers were attacking American commerce. The Adams administration sought emergency powers to deal with potential French invasion and to address what Federalists characterized as a threat from French sympathizers within U.S. borders. The Brennan Center notes the Act authorizes the President to detain, relocate, or deport natives, citizens, denizens, or subjects of a hostile nation during declared war, invasion, or predatory incursion (Brennan Center).

Targeted groups

The Acts broadly targeted immigrants, particularly those from France and other nations perceived as adversarial. The Alien Enemies Act specifically applied to “alien enemies”—defined by nationality or citizenship rather than individual conduct. This distinction meant that individuals could be removed based solely on their country of origin, without evidence of wrongdoing. The Brennan Center analysis emphasizes this ancestry-based approach raises profound constitutional questions about equal protection under the Fifth Amendment (Brennan Center).

Why was the Alien Enemies Act of 1798 created?

The Federalist-controlled Congress created the Alien Enemies Act primarily to address fears of invasion and espionage during the Quasi-War with France. The law represented a belief that wartime demanded extraordinary executive authority over foreign nationals deemed threats to national security.

Political motivations

Beyond the immediate military threat, Federalists saw the Act as a tool to suppress political opposition. The concurrent Sedition Act criminalized criticism of the government, while the Alien Acts gave the executive branch power over immigrant communities that largely supported the rival Democratic-Republican Party. Historical analysis shows Federalists framed immigrants as potential security risks who could aid enemy forces if invasion came.

Federalist support

The Federalist Party, led by figures like Alexander Hamilton and John Adams, strongly supported the legislation. Federalists argued that national security during wartime justified suspending normal legal protections for foreign nationals. The Act passed with Federalist votes, while Democratic-Republicans largely opposed it as an overreach of federal power and an infringement on states’ rights. This partisan split foreshadowed broader constitutional debates about executive authority that continue today.

Is the Alien Enemies Act constitutional?

The constitutionality of the Alien Enemies Act remains contested. The Supreme Court has never struck down the statute, but recent litigation has tested its limits—particularly whether the Act can be invoked in peacetime against non-military groups.

Constitutional challenges

Scholars and advocacy groups argue that using the Act in peacetime violates the Constitution due to lack of due process and habeas corpus protections. The Fifth Amendment entitles aliens to due process in removal proceedings, per Supreme Court precedent (Time Magazine). Texas District Judge Fernando Rodriguez Jr., a Trump appointee, ruled that Trump’s 2025 invocation “is contrary to the plain, ordinary meaning of the statute’s terms” (Time Magazine). New York District Judge Alvin Hellerstein similarly found no evidence of “invasion” or “predatory incursion” by immigrants (Time Magazine).

Supreme Court review

The Supreme Court’s April 7, 2025 ruling in Trump v. J.G.G. addressed the Act’s application without declaring it unconstitutional. The Court held that challenges to Act removals fall within the habeas corpus core and must be filed where the individual is detained, lifting a D.C. temporary restraining order but preserving due process rights (Supreme Court Opinion). All nine justices agreed that individuals subject to the Act are entitled to judicial review via habeas corpus (Time Magazine).

Which party supported the Alien Act?

The Federalist Party was the primary architect and supporter of the Alien Enemies Act in 1798. Federalists controlled Congress and the executive branch under President John Adams, using their majorities to pass the sweeping wartime legislation over Democratic-Republican opposition.

Federalists vs Republicans

Federalists viewed the Act as essential wartime security measure, arguing that immigrants from hostile nations posed invasion risks. Democratic-Republicans opposed the legislation as executive overreach and a threat to civil liberties. The partisan divide over immigration and executive power persists: recent reporting indicates the Act is being invoked by a Republican administration in circumstances its authors never contemplated (Constitution Center).

Modern implications

The Act’s 2025 use by the Trump administration has reignited partisan debate. The Brennan Center urges repeal, citing flaws like ancestry-based detention of civilians that bypasses normal due process protections (Brennan Center). Human Rights Watch argues the Act misaligns with modern international human rights and laws of war (Human Rights Watch).

Timeline of the Alien Enemies Act

Four key periods show how this 226-year-old statute has shaped—and been shaped by—American political and legal history.

These milestones trace the statute’s rare but consequential activations across two centuries.

The implication is clear: courts are increasingly willing to scrutinize what once was considered unchecked executive wartime authority.

Confirmed facts and open questions

Here’s where the evidence stands on this controversial statute.

What experts say

“Trump’s invocation is contrary to the plain, ordinary meaning of the statute’s terms.”

— Judge Fernando Rodriguez Jr., Texas District Court (Trump appointee) (Time Magazine)

“a monster that must for ever disgrace its parents”

— James Madison, on the related Alien Friends Act (Supreme Court Opinion)

“The Alien Enemies Act is one of the worst laws still in force in the United States, and it probably violates the Constitution to boot.”

— Time Magazine editorial (Time Magazine)

“This case presents fundamental questions about who decides how to conduct sensitive national-security-related operations in this country—the president, through Article II, or the judiciary, through TROs.”

— Vice President Kamala Harris, petition to Supreme Court (Constitution Center)

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