A bill may become a law, even without the President's signature, if the President does not sign a bill within 30 days from receipt in his office. A bill may also become a law without the President's signature if Congress overrides a presidential veto by two-thirds vote.
The president can approve the bill and sign it into law or not approve (veto) a bill. If the president chooses to veto a bill, in most cases Congress can vote to override that veto and the bill becomes a law.Beginning at midnight on the closing of the day of presentment, the President has ten days, excluding Sundays, to sign or veto the bill.
