the president
Only the president may veto a bill and if he does it is not passed, however if the bill can get 2/3 of congress to vote yes to the bill then it may be passed. Usually though if a bill is vetoed it is not passed.
Only the president can veto a bill of any kind that is passed by the Congress.
The term for re-passing a bill after a veto is called "overriding" a veto. A bill which is passed by a 2/3 super majority vote in both houses of Congress following a Presidential veto is a law.
The President
The president can veto a bill that congress has passed.
Override
The President can show disapproval of a bill that has been passed by congress by vetoing the bill. Congress, however, can override a presidential veto.
reopen the bill
Override.
Veto
veto a bill passed by congress
"veto" is the term. If the President vetoes a bill passed by Congress, it must be passed by a 2/3 majority in both houses to make it law; otherwise it dies.