Biden says US would defend Taiwan if China launches an 'unprecedented attack'

President Joe Biden said this week that the United States would defend Taiwan if China invaded, appearing to break with the US government's stance of "strategic ambiguity" on the island. 

His comments came in an interview that aired Sunday evening, when a 60 Minutes correspondent asked the president if US forces would defend Taiwan. 
"Yes, if in fact there was an unprecedented attack," Biden responded. 

The president went on to emphasize his administration's support for the "One China" policy, which recognizes the government in Beijing while allowing for informal ties with Taiwan.