Article 1, Section 8, Clause 9:
(The congress shall have power) To constitute Tribunals inferior to the supreme Court;
Article 1, Section 8, Clause 17
(The congress shall have power) To exercise exclusive Legislation in all Cases whatsoever, over such District (not exceeding ten Miles square)...
Article III, Section 1:
The judicial Power of the United States, shall be vested in one supreme Court,