authority to the Commission, they can provide for a legislative veto over regulations that the Commission issues under that delegated authority. This power was first introduced in 2006 as "regulatory procedure with scrutiny", and since 2009 as "delegated acts" under the Lisbon Treaty. This legislative veto power has been used sparingly: from 2006 to 2016, the Parliament issued 14 vetoes and the Council issued 15. Africa : The president can return legislation to the National Assembly for reconsideration within 15 days (or 5 days if the legislation is declared urgent). The National Assemlby can override the veto by passing the legislation once again by an absolute majority. If the president then vetoes the legislation a second time, the National Assembly can ask the Constitutional Court to rule on its constitutionality. If the Court rules that the legislation is constitutional, it becomes law. If the president neither approves nor returns legislation within the prescribed 15- or 5-day period, this operates as a veto, and the National Assembly can petition the Court to declare the law constitutional and effective. This occurred for example in 2008, when President Yayi did not take action on a bill that would set an end date to the "exceptional measures" by which he had kept the National Assembly in session. After pocket-vetoing the bill in this way, the president petitioned the Court for constitutional review. The Court ruled that once the deadline for presidential action had passed, only the National Assembly could petition for review, which it did (and prevailed). : The president has the power to send bills back to the Parliament for a second reading. This power must be exercised within 15 days. On second reading the bill must be passed by an absolute majority to become law. : The president has package, line item and pocket veto powers under Article 35 of the 1986 Constitution. The President has twenty days to sign a bill into law, but may veto either the entire bill or parts of it, after which the Legislature must re-pass it with a two-thirds majority of both houses. If the President does not sign a bill within twenty days and the Legislature adjourns, the bill fails. : The president has a weak constitutional veto. The president can return a bill to the National Assembly if the president has reservations about the bill's constitutionality. If the National Assembly passes the bill a