Art. III, Sec. 2, cl. 2 of the U.S. Constitution provides,
"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."
In the Sixties and Seventies, there were proposals to strip the Federal courts of jurisdiction in busing and desegregation cases. Later, in abortion cases. Now, in cases involving firearms sales and most recently, in habeas and civil rights cases brought by foreigners held in U.S. custody (as at Gitmo or the recently officially-disclosed CIA prisons).
It seems to me that there’s a difference between Congress closing the courthouse doors before a particular type of litigant reaches it, and compelling the courts to throw out already-filed cases. Should there be some kind of grandfathering of pending cases? Is it a violation of equal protection to cut such cases short? What say you?