He vetoes it. ( He might threaten to veto it before it is passed either publicly or in private messages to members of Congress. )
He or she does not want a law passed
The President
In the USA, if a law passed both houses of congress, the president has to sign the "bill" to make it a law. Then the president's job is to effect the law -- to carry out the law (which may or may not be done in a timely manner).
For the bill to become law, the President must sign the bill, or Congress must override his or her veto. So, if the President forgot about the bill, it would not become law.
To make a bill a law, the president signs it. However, if the president takes no action before the time for the president's action expires, and Congress is still in session, the bill automatically becomes law.
the congress can veto a law the president passed
This act was signed by President Lyndon Johnson. The House version was passed while Kennedy was president but Johnson was the president by the time it was passed by the Senate and became law.
Congress cannot veto a law. Any law must be written and passed by Congress in the first place. The president can then veto it. Congress can override the veto with a 2/3 majority. After a law is passed, the Supreme Court can strike it down if they declare the law unconstitutional.
All branches of law have different powers. This is to prevent any one branch from becoming more powerful than the others. Also, Congress has the power to create statutory law. The President is one man, and if he made statutory law it would be more likely to be a law he wants passed instead of one that the people want passed.
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