He/she can sign it into law or veto it.
Near the end of a session of Congress, the President may refuse to sign a bill, and it cannot be returned to the Congress. This is called a "pocket veto."
1. He could sign the bill, in which case it would immediately be considered valid.
2. He could veto it, and it would not be valid. Comgress could, however, later override the veto and the law would be valid.
3. He could do nothing with it (called a "pocket veto"). He might do this as a symbolic gesture even though he knows he will be overridden.
he can sign it and make it a law or he can veto it(reject)
Override a veto
If both houses of congress pass it, it goes to the president. If and when he signs it, it becomes law.
The president will veto it
the president sings it.
If both houses of congress vote by 2/3 to override a presidential veto, it automatically becomes law despite the President's veto.
10 days
The U.S. Congress passes bills that become Federal Laws when the U.S. President signs them (although there are cases in which Congress can make a bill into a law without the President's approval), and each state Congress passes bills that become state laws when the Governor of the state signs them.
Congress must set its own pay.
checks and balances
Since the Constitution places the power and responsibility for passage of legislation with the Congress, passing a law is more an example of the basic function of the legislative branch than an example of checks and balances. However, it could become an example of checks and balances if Congress passes a law, the President vetoes it, and Congress then overrides the President's veto as provided in the Constitution.
"general assembly" is a term usually applied to a state legislature. The Governor of most states, if not all, has veto power.