Rivals - America's Endgame

President Trump and President Xi are expected to meet next week to help the US and China resolve a trade war which has rocked the world economy. But this is a rivalry about much more than just trade, one which spans economics, defence, culture and tech. As part of a season on BBC World News and BBC.com about the US and China, David Grossman has been speaking to influential voices in and close to the Trump administration who view China as an existential threat to the west. So, what is America’s endgame?