It can declare the presidents actions unconstitutional.
The judicial branch
The judicial branch doesn't check the presidents power to veto specifically. The legislative can however find the actions of the president unconstitutional through judicial review. The presidents power to veto is checked by the legislative, as congress can override the veto by a 2/3 majority.
The legislative Branch can check the Judicial branch in that Congress can approve the Judicial appointments, they can also impeach judges and remove them from office.
Congress may impeach an official from the judicial branch, or the executive branch, for abusing their power. However, the judicial branch holds the trial.
The Judicial branch has the power to interpret the laws, or decide if they are unconstitutional. The checks on the Judicial branch are the power of the executive branch to enforce the laws and the power of the legislative branch to make laws.
they can issue a supreme court decision
Can declare laws unconstitutional
To check the power of the Judicial and the Legislative Branches
The power to declare legislation to be unconstitutional and, therefore, unenforceable.
to check the actions of the federal courts
The Judicial Branch had this power. The process in which this branch declare laws constitutional or unconstitutional is called the Judicial Review
Like the other two branches it has the ability to check the power of the Executive and Legislative branches. Its main check is the fact that it can rule certain actions of presidents or congress unconstitutional, making the illegal.