I do not know if the matter was raised below. See the listing of matters committed to other branches according to Brennan in Baker v. Carr . Separation of powers and political question matters relate to each other. Both concern institutions staying within their own spheres. In PQ matters, the court decides to decline to exercise its jurisdiction.
Repeal is a legislative action.
The power does not reside in either a court or the executive. The dissents agree. Comment on Q 9. Comment on Q 10. These papers were written by Hamilton and Madison to urge adoption of the Constitution.