Takeaway
In short, this case established the plenary-power doctrine: Congress may exclude noncitizens as an incident of national sovereignty, may override prior treaty commitments through later legislation, and need not honor an alien's prior statutory permission to reenter.
Chae Chan Ping was a Chinese laborer who had lived in the United States and left for China in June 1887. Before leaving, he obtained a return certificate under the Chinese Exclusion Act of 1882, as amended in 1884. The certificate stated that he could return and reenter the United States.
While he was abroad, Congress enacted the Scott Act of October 1, 1888. The Act barred Chinese laborers who had departed and had not returned before its enactment, voided previously issued return certificates, and prohibited admission based on those certificates. When Chae Chan Ping arrived in San Francisco later that month, customs officials refused him entry.
He petitioned for habeas corpus in federal circuit court, arguing that the Scott Act violated treaties with China and destroyed rights granted by the earlier exclusion statutes and his certificate. The circuit court denied relief and upheld the exclusion. The Supreme Court affirmed.
Issue #1
Whether the Scott Act was invalid because it conflicted with existing treaties between the United States and China.
Holding
No. Congress could enact a later statute inconsistent with treaty provisions, and the later expression of national will controlled in domestic courts.
Reasoning
The Court acknowledged that the Scott Act contradicted express provisions of the Burlingame Treaty of 1868 and the supplemental treaty of 1880. Those treaties had recognized freer migration and, in the 1880 treaty, had allowed Chinese laborers already in the United States to go and come of their own free will. But conflict with a treaty did not itself make the later statute invalid.
Under the Supremacy Clause, treaties and federal statutes are both supreme law of the land. Neither has categorical priority over the other. Where a treaty is self-executing and concerns a subject within Congress's authority, it operates domestically as the equivalent of legislation and may be modified or repealed by a later act of Congress. The Court relied on the Head Money Cases and Whitney v. Robertson for that last-in-time principle.
Whether the United States had sufficient diplomatic or moral justification to depart from its treaty obligations was a political question for Congress and the Executive, not the judiciary. Courts could determine the statute's meaning and apply it, but could not review Congress's motives or decide whether the Nation should have maintained its international commitments. Any complaint by China had to be pursued through diplomatic channels.
Issue #2
Whether Congress possessed constitutional authority to exclude Chinese laborers, including laborers who had previously lived in the United States and held statutory certificates permitting their return.
Holding
Yes. The power to exclude foreign nationals is an inherent incident of national sovereignty, entrusted to the United States in its foreign-relations powers, and Congress's determination that exclusion serves national interests is conclusive on the courts.
Reasoning
The Court began from the proposition that Chae Chan Ping was an alien, not a United States citizen. An independent nation has exclusive authority over its territory and therefore possesses the power to exclude aliens. Without that power, the Nation would be subject, to that extent, to the control of foreign powers.
The United States acts as one nation in its relations with foreign countries. Its powers over war, treaties, foreign commerce, naturalization, invasion, and national security belong to the national government rather than to the States. The exclusion of aliens was therefore within the sovereign authority that the Constitution delegates to the federal government.
The Court treated the exclusion power as essential to national self-preservation. Congress could conclude that the presence of foreigners whom it regarded as unable to assimilate posed a danger to peace or security, even absent a declared war or active hostilities with their country of origin. Once the political branches determined that exclusion was required by the public interest, that determination could not be second-guessed by the judiciary.
The Court supported this conclusion with longstanding executive-branch statements recognizing every nation's authority to exclude foreigners deemed dangerous or objectionable. Federal laws excluding particular classes, such as paupers, criminals, and persons with certain diseases, illustrated the same general sovereign power.
Issue #3
Whether Chae Chan Ping's return certificate or the earlier exclusion statutes created a vested right of reentry that Congress could not revoke.
Holding
No. The certificate gave only a revocable permission to return, not a vested property right immune from Congress's later exercise of the exclusion power.
Reasoning
The Court held that governmental authority over the admission of aliens cannot be permanently surrendered through prior legislation or a certificate issued under it. Congress holds that authority in trust for the Nation and may exercise it when, in its judgment, the public good requires. A prior license to reenter was therefore held at the government's will and could be withdrawn.
The Court distinguished vested rights in property from an expectation that a legal permission or immigration policy will continue. Treaty-based rights concerning property, such as the right to inherit or own land, may survive the termination of a treaty because they are capable of transfer and enforcement as private rights. Chae Chan Ping's asserted right to return, by contrast, was personal, nontransferable, and dependent on the continuing permission of the government.
The Court emphasized that Congress might reasonably have chosen a less sweeping rule, such as applying the ban only to laborers who departed after the Scott Act's enactment. But the fairness or wisdom of Congress's decision was not a judicial question once Congress had constitutional power to make it.