nationalism, protectionism, is the lack of american leadership? because after all, certainly, there's no other country that can fill it right now. >> i think president biden has led on global taxation. he's putting forward proposals on climate and on vaccination, but i think what's really happening here is america is used to acting unilaterally in what used to be a unipolar age, and american has now got to lead at multilateral action in a multipolar age. there's no use harkening back to an age where you can say something and it's going to be done. you have to bring other people along with you. and that didn't happen, as you know, over afghanistan, but it did happen over this climate summit and it could happen over vaccination, the two big public policy failures of our time. yes, i look to american leadership, but it's america leading a multicolateral approach in a multipolar era.