He cannot. The president can veto the bill, returning it to Congress without his signature. Congress can override the President's veto by a two-thirds vote of both the House and the Senate. If the Congress overrides the President's veto, it becomes law even if he doesn't like it.
If the President refuses to enforce the law, he is violating his Constitutional oath to ensure that the laws will be faithfully executed, which would be an impeachable offense. Congress could then "fire" the President by removing him from office.
A president can veto a bill that the congress passes and sends to him for his signature and he can refuse to sign it (vetoing it). But the president cannot override vetos. The congress can override president's veto by a 2/3 vote.
If the president vetoes a bill, then Congress can override that vetoe, but the bill must go back to Congress to be approved with a majority vote.
2/3rds of congress must vote to override
The bill that the President has vetoed must be passed with a 2/3 favorable vote in both houses of Congress in order to become law.
A congressional override means that a bill has become a law even if the President refuses to sign it. The Congress can override it with two-thirds vote with both houses voting separately.
they can override any bill that the president has vetoed
A president can veto a bill that the congress passes and sends to him for his signature and he can refuse to sign it (vetoing it). But the president cannot override vetos. The congress can override president's veto by a 2/3 vote.
The president can either choose to sign the bill into law or veto it, but Congress can override a veto.
If the president vetoes a bill, then Congress can override that vetoe, but the bill must go back to Congress to be approved with a majority vote.
After the president vetoes a bill, it goes back to Congress. Congress can try to override the veto with a two-thirds majority vote in both the House of Representatives and the Senate. If Congress successfully overrides the veto, the bill becomes law despite the president's objection. If Congress does not override the veto, the bill does not become law.
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.
override veto
If a US president vetoes a bill sent to him by the US Congress, the president may choose to veto the bill. In such a case, the bill is sent back to the congress. If the Congress can come up with a two thirds majority, then the bill must pass as law.
the president can veto any bill passed by congress, which requires 2/3 of both houses to override
If congress gets a two/thirds majority, then they can override the president's veto.
If a president says no to a bill, it's called a veto. Then after that, he has to send it to Congress which is the Judical Branch. Then Congress looks over the bill, and they can override the bill and it can still be passed.
In order to override a veto by the president, both houses of Congress must pass the bill again by a 2/3 majority.