Article VI of the Constitution declares that the Constitution and all federal laws made in pursuance of it “shall be the supreme Law of the Land,” binding every State “any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.” In plain terms, constitutionally authorized federal law, such as immigration law, supersedes all conflicting state or local measures, as well as any contrary international norms or agreements.
Article II, Section 3 charges the President with the duty to “take Care that the Laws be faithfully executed.” When a law is federal, it is the President’s responsibility, using the tools of the executive branch, to execute it.
The Constitution grants Congress explicit authority over immigration through Article I, Section 8’s Naturalization Clause and Article I, Section 9’s Migration Clause, empowering the federal government to create and enforce immigration law.
Article I, Section 8 also authorizes the federal government to call forth the militia “to execute the Laws of the Union, suppress Insurrections, and repel Invasions,” while Article IV, Section 4 obligates the United States to protect each State against invasion, including unlawful entry into the country.
Taken together, these provisions affirm President Trump’s actions regarding immigration law as legal and constitutional.
In 1807, Congress enacted the Insurrection Act, giving the executive branch statutory authority to act on the Constitution’s provisions for suppressing rebellion and enforcing federal law. Signed during Thomas Jefferson’s presidency, the Act permits a president to deploy U.S. military forces on American soil when necessary to quell unrest, uphold federal authority, or protect civil rights (an issue highlighted recently when anti‑ICE protesters trespassed into a church to protest a pastor they accused of supporting ICE). In response to escalating, unlawful violence against ICE agents in Minneapolis and other cities, President Trump has indicated he is considering invoking the Insurrection Act to restore order.