1990 to 2012, this power was used an average of once every three years. The president may also, on request of a majority of Seanad Éireann (the upper house of parliament) and a third of Dáil Éireann (the lower house of parliament), after consulting the Council of State, decline to sign a bill "of such national importance that the will of the people thereon ought to be ascertained" in an ordinary referendum or a new Dáil reassembling after a general election held within eighteen months. This latter power has never been used because the government of the day almost always commands a majority of the Seanad, preventing the third of the Dáil that usually makes up the opposition from combining with it. : The president may request a second deliberation of a bill passed by the Italian Parliament before it is promulgated. This is a very weak form of veto as the parliament can override the veto by an ordinary majority. While such a limited veto cannot thwart the will of a determined parliamentary majority, it may have a delaying effect and may cause the parliamentary majority to reconsider the matter. The president also has the power to veto appointments of ministers in the government of Italy, as for example president Sergio Mattarella did in vetoing the appointment of Paolo Savona as finance minister in 2018. : The president may suspend a bill for a period of two months, during which it may be referred to the people in a referendum if one-tenth of the electorate requests a referendum. The president may also return a document to the Saeima for reconsideration, but only once. Notably, in 1999, president Vaira Vike-Freiberga returned the Latvian State Language Law to the Saeima, even though the law had passed by an overwhelming majority the first time; the president used the suspensory veto to point out legal problems with the law, which resulted in amendments to bring it into line with European legal standards. : The president may either submit a bill to the Constitutional Tribunal if they suspect that the bill is unconstitutional or send it back to the Sejm for reconsideration. These two options are exclusive: the president must choose one or the other. If president has referred a law to the Constitutional Tribunal and the tribunal says that the bill is constitutional, the president must sign it. If the president instead returns