Whether Congress has constitutional authority to expel resident aliens, including Chinese laborers who had lawfully entered and resided in the United States.
Holding
Yes. Congress possesses an inherent national power to exclude and expel aliens, and that power extends to resident Chinese laborers who have not become citizens.
Reasoning
The Court treated exclusion and deportation as connected parts of the same sovereign power. A nation may refuse admission to foreigners and may also require aliens already within its territory to depart when their presence is considered inconsistent with the public welfare. That authority belongs to the United States as a sovereign nation responsible for foreign relations, national security, and relations with other countries.
The Constitution commits foreign-affairs powers to the national government: the President conducts diplomacy and executes federal law, while Congress regulates foreign commerce, naturalization, war, and related matters. Because immigration and removal of aliens directly concern international relations, the states have no comparable authority and Congress may regulate the subject through legislation.
Chinese laborers lawfully residing in the United States remained aliens. While permitted to stay, they were entitled to constitutional and legal protections for their persons and property, but they had not acquired a permanent constitutional right to remain. Congress could withdraw the permission to remain when, in its judgment, the public interest required removal.
The Court relied heavily on Chae Chan Ping v. United States, which had sustained Congress's power to exclude a Chinese laborer who had previously lived in the United States and held a return certificate. That decision established that a statutory permission to enter or return was a revocable governmental license, not a vested personal right that Congress could not later alter.