political debate in the united states, there is an increasing fashion and each party that says we want to withdraw from world leadership because we have been debt ourselves, this is the burden of other countries, what's your message to americans who say that? >> america can't withdraw from world leadership. america is the leader of the law from reading world and america itself will be threatened if of the us doesn't step up. if authoritarian regimes get a stranglehold, if vladimir putin is successful and president xi continues his expansion ambitions, what happens next? what happens if the dollar loses its reserve currency status? what happens to america itself?