Argentina will not let Citigroup quit custody business: government source

Argentina will not allow Citigroup Inc. to exit its local custody business, a senior source in the government said on Wednesday, setting up a possible showdown between the leftist government and the banking giant over sovereign debt payments. President Cristina Fernandez' has threatened to cancel Citibank Argentina's operating license if it refuses to process a March 31 interest payment, putting at risk the group's retail banking business in Latin America's No. 3 economy. &qu