Thank you for the very informative post.
So the Constitution doesn’t grant such authority?
I see you listed an example of the SCOTUS…does that decision give the district judges “authority” or do we need the SCOTUS to decide?
The constitution doesn't say much about a court's power except the following:
Article 3, section 1 provides: "[t]he judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish."
Article 3, section 2 provides:
"[t]he judicial Power shall extend to all Cases, in Law and Equity, arising under this Constitution, the Laws of the United States, and Treaties made, or which shall be made, under their Authority;--to all Cases affecting Ambassadors, other public Ministers and Consuls;--to all Cases of admiralty and maritime Jurisdiction;--to Controversies to which the United States shall be a Party;--to Controversies between two or more States;--between a State and Citizens of another State;--between Citizens of different States;--between Citizens of the same State claiming Lands under Grants of different States, and between a State, or the Citizens thereof, and foreign States, Citizens or Subjects."
In all Cases affecting Ambassadors, other public Ministers and Consuls, and those in which a State shall be Party, the supreme Court shall have original Jurisdiction. In all the other Cases before mentioned, the supreme Court shall have appellate Jurisdiction, both as to Law and Fact, with such Exceptions, and under such Regulations as the Congress shall make.
The Trial of all Crimes, except in Cases of Impeachment; shall be by Jury; and such Trial shall be held in the State where the said Crimes shall have been committed; but when not committed within any State, the Trial shall be at such Place or Places as the Congress may by Law have directed."
Article 3 relates to treason that isn't overly relevant to the issue at hand.
Article 3, Section 2 is the jurisdictional and empowerment section. You will note, that there is no real limit or description of what the courts are permitted to do (subject to the jurisdictional threshold questions, etc. There's no grant by the constitution that actually says judges have lifetime tenure either. There is no authorization in the constitution for creating a federal common law; rules of evidence, etc. These things exist today for good reason.
Nationwide injunctions are not explicitly authorized or prohibited. Much like rules of evidence, etc. Congress can change that.