The Legislative Branch has the power:
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They can:
Veto Legislation
Call Congress into special session
Implement (or fail to implement) laws passed by Congress
Appoint judges, justices and cabinet members
The president can veto bills that congress creates.
In order to balance that, congress can override a veto.
In order to keep a balance on both of these, the Supreme Court can declare any law unconstitutional.
The president also appoints the Supreme Court Justices, but congress has to approve of these appointments. So there is another round of checks and balances.
Veto
Through the veto power.
The President has the power to veto or deny Congress's bill's passing.
Both the Judicial and Legislative branch can check the Executive branch. The Judicial branch has the power of judicial review and can declare any act of the Executive branch to be unconstitutional and therefore void. The Legislative branch has a number of checks on the Exectuive branch. The President, the head of the Executive Branch, can appoint federal judges but the Senate must approve.
The executive check over the legislative branch is the power of vetoing laws. The executive check over the judicial branch is the power of judicial appointment -- the president can pick a judge to take the seat of a judge who leaves the supreme court.