Nawaz Sharif, who was ousted as Pakistan Prime Minister in 1999 by Pervez Musharraf, said Monday that the president should resign immediately. “He is a one-man calamity and the source of all the problems,” Pakistan’s most experienced opposition politician said, “The country is burning.” At a news conference in the headquarters of his faction of the Pakistan Muslim League, Sharif also called for the formation of a government of national consensus. Sharif also said that his party would participate if the parliamentary elections went ahead on January 8. Government officials are due to decide Tuesday on whether to postpone elections.