A treaty is an international agreement. Obviously the US Supreme Court has no juristiction over treaty between two other countries.
The president has the explict power to sign treaties, providing they have a 2/3 majority in the senate. However most treaties the US enters into are less formal "agreements"
The treaty becomes part of US federal law, and can (like any other federal law) be subject to judicial review. On rare occasions "agreements" have been rejected by the supreme court (Reid v Covert) and in this case the US would break international law and break the treaty. (Sovereign states cannot be forced to comply with treaties that they have signed except by military action, but other countries can put pressure to encourage compliance) No full Treaty (with 2/3 support) has been rejected by the court, but there is no constitution bar to this.
The judicial branch, specifically the Supreme Court, can declare laws unconstitutional.
The Supreme Court gained the power to declare laws unconstitutional
The name given to the Supreme Court's power to declare a law unconstitutional is judicial review.
the supreme court can declare laws unconstitutional
the supreme court can declare laws unconstitutional
the supreme court can declare laws unconstitutional
The Supreme Court's task is to declare whether an act is constitutional or unconstitutional
judial review
The judicial branch. Or the supreme court.
it can declare a law unconstitutional
The SC can declare a law constitutional or unconstitutional.
No. The Supreme Court has the ability to declare something unconstitutional or not. If they have declared something unconstitutional then there is nothing the president can do about it.