What can happen if the president chooses to veto a law that has been passed?

If the president chooses to veto a law that has been passed, The president's decision can be overridden by a majority of Congress.

A veto is the power used by an officer of the state, for example, to stop an official action unilaterally, especially the legislation enactment .

Override of a veto is the process by which each chamber of Congress votes on a bill vetoed by the President. To pass a bill over the president's objections, it requires a two-thirds vote in each Chamber. It means If the US President vetoes a bill already passed by Congress, then Congress has a chance to override this veto with a 2/3rds vote of both houses. Historically, Congress has overridden fewer than ten percent of all presidential vetoes. Congress checks on the power of the presidency by overriding a presidential reversal or veto. If a president refuses to sign a bill into law, the congress men can still manage to pass that bill into law, if 2/3 of them can vote in favor of the bill. That is, to pass a bill into law despite the president's objection, then it requires a two-third vote from each of the chamber. 

According to article I, section 7 of the Constitution grants the President the authority to veto legislation passed by Congress

Grade:  9

Subject:  social studies

Chapter:  veto

Keywords:  veto

jupiter is mainly composed of hydrogen and helium just like a star. spectral analysis of jupiter has revealed that in addition to hydrogen and helium, the planet is made of water, methane and ammonia. those elements are in trace amounts. the core of the planet is thought to contain some rock and metallic hydrogen. i hope this will give you the answer to your question! : d

answer; i do believe that its(gestation,suction-aspiration or vacuum aspiration;