we will fight to win. from now on, victory will have a clear definition. attacking our enemies, obliterating isis, crushing al qaeda, preventing the taliban from taking over afghanistan, and stopping mass terror attacks against america before they emerge. >> the tt vowing to lead u.s. troops to victory in afghanistan. in 2012 he called the u.s. mission in afghanistan a total disaster and in 2013 he insisted u.s. troops should, quote, leave afghanistan immediately. so how do you do dpo from promising to end the war to approving a plan that will boost troop levels? robert costa is our national political reporter for "the washington post" and an msnbc political analyst. his latest story gives us an inside look on how trump arrived at the decision. good to see you. let me start with the