US Secretary of State Hillary Clinton has been in discussions with the White House about leaving her job next year to become head of the World Bank, sources familiar with the discussions said on Thursday. The former first lady and one-time political rival to President Barack Obama quickly became one of the most influential members of his cabinet after she began her tenure at State in early 2009. She has said publicly she did not plan to stay on at the State Department for more than four years. Associates in the USA say Mrs Clinton has expressed interest in having...