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How does the president veto a bill? The president returns the bill to the originating chamber, along with a written explanation of the reason for the veto, within 10 days. The president must wait at least 10 days and then must return the bill to both the House and the Senate. The president takes no action on the bill for 10 days, and then the bill is considered vetoed. The president returns the bill to the originating chamber within 10 days, but is not required to give an explanation of the reason for the veto.