After passage by both houses, a bill is enrolled and sent to the president for approval. The president may sign it making it law or veto it, perhaps returning it to Congress with the president's objections. A vetoed bill can still become law if each house of Congress votes to override the veto with a two-thirds majority. Finally, the president may do nothingneither signing nor vetoing the billand then the bill becomes law automatically after ten days (not counting Sundays) according to the Constitution. But if Congress is adjourned during this period, presidents may veto legislation passed at the end of a congressional session simply by ignoring it; the maneuver is known as a pocket veto, and cannot be overridden by the adjourned Congress.