If the president vetoes a bill, both houses of congress must obtain a majority vote in order to override the veto.

two-thirds

one-third

three-fifths

three-fourths

By threatening a veto, the President can persuade legislators to alter the content of the bill to be more acceptable to the President. Congress can override a veto by passing the act by a two-thirds vote in both the House and the Senate. (Usually an act is passed with a simple majority.)