Summary: In this week's podcast: The race for the Republican nomination heats up in the US; Yemen on the brink of collapse; the E.coli outbreak in Europe causes rift between Spain and Germany. Presented by Gideon Rachman with Clive Crook in the studio in London, Abigail Fielding-Smith in Beirut and Quentin Peel in Berlin. Produced by LJ Filotrani
