second time, the president must either sign it or refer it to the Constitutional Court of South Africa for a final decision on whether the bill is constitutional. If there are no constitutional concerns, the president's assent to legislation is mandatory. : The president has package veto and item veto powers. This power must be exercised within 30 days of receiving the legislation. The first time the president returns a bill to the Parliament, the Parliament can pass it again by a simple majority vote. If the president returns it a second time, the Parliament can override the veto with a 2/3 vote. This occurred for example in the passage of the Income Tax Amendment Act 2016, which exempted legislators' allowances from taxation. : Under the 1996 constitution, the president had an absolute pocket veto: if he neither assented to legislation nor returned it to parliament for a potential override, it was permanently dead. This unusual power was eliminated in a general reorganization of the Constitution's legislative provisions in 2016. Americas : The President of the Republic is entitled to veto, entirely or partially, any bill which passes both houses of the National Congress, exceptions made to constitutional amendements and congressional decrees. The partial veto can envolve the entirety of paragraphs, articles or items, not being allowed to veto isolated words or sentences. National Congress has the right to override the presidential veto if the majority of members from each of both houses agree to, that is, 257 deputies and 41 senators. If these numbers are not met, the presidential veto stands. : The King-in-Council (in practice the Cabinet of the United Kingdom) may instruct the governor general to withhold the king's assent, allowing the sovereign two years to disallow the bill, thereby vetoing it. Last used in 1873, the power was effectively nullified by the Balfour Declaration of 1926. At the province level, lieutenant governors can reserve royal assent to provincial bills for consideration by the federal cabinet. This clause was last invoked in 1961 by the lieutenant governor of Saskatchewan. In addition, the Governor General in Council (federal cabinet) may disallow an enactment of a provincial legislature within one year of its passage. : The president has only a package veto (observación a la ley), which must be exercised within 10 days after the legislation is passed. The veto must include a rationale. If both chambers of the