[StormEye]

11) May approve or veto legislation passed by Congress.

( Actually the President isn't required to do anything about
legislation passed by Congress. If he does nothing the legislation will become law in 30 or 45 days. I'll have to check the Constitution about the amount of time.)

[stylin19a]

Art. I Sec 7

If any Bill shall not be returned by the President within ten days (Sundays excepted) after it shall have been presented to him, the same shall be a Law, in like manner as if he had signed it, unless the Congress by their Adjournment prevent its return, in which case it shall not be a Law.

If it does not become law, it is because of a pocket veto and can't be overridden. Congress has procedures in place to prevent pocket vetoes.