In Bryan v. The United States, the Supreme Court was asked to decide whether a state court could issue an injunction against a federal officer in order to prevent him from executing his duties under federal law. At issue was whether or not the state court had jurisdiction over matters related to federal law and if so, what limitations applied. In its ruling, the Supreme Court held that while states do have some authority over certain matters of national concern such as bankruptcy proceedings and admiralty cases, they cannot interfere with any matter which is exclusively within the domain of Congress or has been delegated by it to another branch of government. Furthermore, no state can pass laws which conflict with those enacted by Congress or impede their execution in any way whatsoever. Thus, this case established that states may not interfere with matters concerning solely national concerns nor can they pass legislation contrary to existing federal statutes without risking being found unconstitutional by the courts.

In Bryan v. United States, the Supreme Court was asked to decide whether a state court could issue an injunction against a federal officer in order to prevent him from executing his duties under federal law. The majority opinion held that such an action would be unconstitutional because it would interfere with the exclusive powers of Congress and undermine the supremacy of federal laws over those of states. However, Justice Grier dissented on this point and argued that while he agreed with the majority's conclusion regarding constitutional issues, there were other considerations at play as well. He noted that if state courts had no power to enjoin officers from carrying out their official duties then citizens would have no recourse when they felt wronged by them or believed their rights were being violated by them acting outside their authority. Thus, Justice Grier concluded that allowing state courts to issue injunctions against federal officers should not be considered unconstitutional so long as it did not conflict with any specific congressional act or otherwise impede upon Congress' exclusive powers granted by Article I Section 8 of the Constitution.