What action delays the signing of a bill and causes the bill to not go into effect?

A presidential veto delays the signing of a bill and prevents it from going into effect. When the president disagrees with the bill, they can reject it, sending it back to Congress with their objections. Congress can attempt to override the veto with a two-thirds majority vote in both chambers; if they fail to do so, the bill does not become law. Additionally, if the president takes no action within ten days while Congress is in session, the bill automatically becomes law, but if Congress adjourns during that period, the bill is effectively "pocket vetoed" and does not go into effect.