China looms large over Obama trip

US President Barack Obama speaks during a bilateral press conference with the Philippines President Benigo Aquino (not in picture) at Malacanang Palace in Manila on April 28, 2014.
US President Barack Obama speaks during a bilateral press conference with the Philippines President Benigo Aquino (not in picture) at Malacanang Palace in Manila on April 28, 2014.

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    China looms large over Obama trip

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EXCLUSIVE: Christiane Amanpour speaks with Former American Ambassador to China Gary Locke.