Football fans all over the world dream of meeting Lionel Messi - but they may be disheartened to learn even arguably the most powerful man on the planet cannot pin down the Ballon d'Or winner. Barack Obama, the president of the United States, revealed while speaking on a trip to Argentina that he had brought his daughters along to see the country and meet a couple of famous faces. "I wanted to bring my daughters here, so they could see the beauty and the vibrancy of [Buenos Aires]," Obama said.  "They've already met one famous Argentinean - His Holiness Pope Francis. Then they wanted to meet Messi, but I could not arrange that." They might have to stick around a while longer -- Messi and Argentina have travelled to Chile for a rematch of the Copa America final on Thursday and will then return home to take on Bolivia.