RIYADH — Saudi Arabia on Wednesday nominated Mohammed Al-Tuwaijri, ex-minister of economy and planning as a candidate for the post of Director-General at the World Trade Organization on the last day of the nomination. The current WTO chief Roberto Azevêdo is stepping down on Aug. 31 this year. Shortly after the nomination period closes, candidates will be invited to meet with members at a special WTO's General Council meeting, present their views and take questions from the members. Apart from Al-Tuwaijri, who is an adviser at the royal court, six other candidates are so far in the running, namely from Egypt, Kenya, Mexico, Moldova, Nigeria and South Korea.