I think that bias is not a fixed thing. It's not as though some people are biased and others are not. It ebbs and flows. It can be manipulated. It changes according to a person's circumstances.

I do think Donald Trump would be a catastrophic turn in American history.

One book that I heard was circulating the Green Zone was "Bureaucracy Does Its Thing" by Robert Komer , who worked for President [Lindon] Johnson in Saigon. This book is about the inevitably of screwing up when a country takes on a war with so little understanding of the country they are fighting.

I've read a lot of war writing, even World War I writing, the British war poetry of Wilfred Owen and Siegfried Sassoon, Robert Graves's memoir "Goodbye to All That," and a civilian memoir "Testament of Youth" by Vera Brittain .

In a sense, whites who were always sort of the unthinking majority who didn't think of themselves necessarily as one among many interest groups but is simply the dominant group, now as whites become - are close to becoming a minority of Americans, are becoming a political interest group. And that's what Donald Trump is playing to. And it's a really dangerous, volatile game.

I would caution anyone who thinks the solution is to get out to realize that Iraq will be our problem, whether we're there or not, for years to come. It will not be Vietnam; it will not let us go home and lick our wounds.

Politics should seize the imagination.