>> jeff zeleny, thanks so much. if you search for biographies of president biden to better understand his thinking, you will not find a vast library. let's bring in evan osnos, one of the few biden biographers, who wrote the book joe biden, the life, the run and what matters now. also a staff writer for the "new yorker." thanks for joining us. president biden says there was no good time to leave afghanistan. we should note he's long been a skeptic of the u.s. experiment there after the initial mission of defeating al qaeda was complete. here he is almost ten years ago in 2012. >> we've been in this war for over a decade. the primary objective is almost completed. now all we're doing is putting the kabul government in a position to be able to maintain their own security. it's their responsibility. not america's. >> in fact, then the vice president, individuals against