No- he does not have to sign a bill passed over his veto.
According to the US Constitution, Congress has "the power of the purse". This means that Congress approves the budget submitted by the President. It's one of the checks and balances built into the Constitution to ensure that one branch doesn't hold too much power.
the president can veto acts of congress
Override a veto
What the congress has to do first is they have to get a hole lot of people to say YES to the law. They have to out vote the president.
If congress gets a two/thirds majority, then they can override the president's veto.
No. If the bill is vetoed by the President the bill goes back the congress where in order for it to get passed two thirds of congress has to vote for it.
they can override any bill that the president has vetoed
Any bills passed by the House of Representatives can be vetoed by the President. The President may veto the entire bill or any part of it.
Congress can override a presidential veto with a 2/3 majority vote.
Andrew Johnson is the US president that vetoed a bill just to have it overturned by congress in less than 24 hours.
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Congress can override the veto by a 2/3s vote in both the House and Senate.