Constitution of Nigeria, which states that "any citizen of Nigeria of full age who wishes to renounce his/her Nigerian citizenship shall make a declaration in the prescribed manner for the renunciation", which the government is obliged to register except when Nigeria is physically involved in a war or when the President of Nigeria is of the opinion that the renunciation is contrary to public policy. Under section 29(4)(a), a person of either gender becomes "of full age" at eighteen years, while under section 29(4)(b) a girl younger than that is still deemed to be "of full age" if she is married. In 2013, the Senate of Nigeria proposed a constitutional amendment to delete section 29(4)(b), which would have the effect that girls could only renounce Nigerian citizenship at the age of eighteen or older regardless of their marital status; the amendment passed by a vote of 75–14, two votes greater than the two-thirds supermajority required for the passage of constitutional amendments. However, after the vote, a point of order was raised against the amendment by Senate Deputy Minority Leader Ahmad Sani Yerima (ANPP-Zamfara), who stated that Schedule 2 of the Constitution prohibited the National Assembly of Nigeria from legislating on any matters relating to customary or Islamic law. Some sources suggested that the amendment would have the effect of outlawing child marriage, a matter of personal concern to Yerima due to his 2009 marriage to an Egyptian girl then only 13 years old. Senate President David Mark was initially disinclined to permit a second vote on the matter, but relented after an argument. Yerima's arguments were sufficient to convince enough erstwhile supporters and non-voters to oppose the amendment; with a vote of 60–35, it was deprived of its supermajority and failed to pass. Singapore Citizens of Singapore can only renounce Singaporean citizenship if they have acquired citizenship of another country. At the time of renunciation, renunciants must submit their Singaporean passports and National Registration Identity Cards for cancellation. Male Singaporeans generally cannot renounce citizenship until completing military service, though there are exceptions for those who emigrated at a young age (generally those who were not educated in Singapore). In 2012, a Hong Kong-born man who had acquired Singaporean citizenship by registration while a minor filed a lawsuit regarding this requirement. About 1,200 Singaporean citizens renounce their citizenship every year, a quarter of them naturalised citizens. Singapore does not permit multiple