Art III of the US Constitution....
Texas filed the suit directly in the Supreme Court. Article III of the Constitution lists a small number of categories of cases in which the Supreme Court has “original jurisdiction.” One of those categories concerns “Controversies between two or more states.” Texas’s suit is exactly that.
Thanks Jane. The way I see it is as follows:
(1) Article III gives the Supreme Court jurisdiction over the case.
(2) The fact that the voting in other states can result in Texas being sent off to war gives Texas standing, at least for the national office elections in other states.