pakistan's refusal to lift its blockade of nato supplies bound for afghanistan has somewhat marred the summit for the white house. president obama had invited pakistan's president zardari to chicago and then refused to even meet with him, passing him along to secretary of state hillary clinton. this latest dispute is over whether the u.s. should formally apologize for mistakenly killing 24 pakistan troops in a cross border raid six months ago. with me now to talk about nato summit is former secretary of state madeleine albright. madame secretary, thank you very much. also the author of "prague winter," your wonderful new memoir of the years from '38 to '45. >> it's great to be on with you, andrea. thank you very much. >> it's nato so you've got your nato pin. >> i do. this is a special one. it was given to me by the supreme allied commander.