Trump says US can't afford quick Afghanistan withdrawal

Declaring the U.S. will win "in the end," President Donald Trump vowed Monday night to keep American troops fighting in Afghanistan despite his earlier inclination to withdraw. But he insisted the U.S. would not offer "a blank check" after 16 years of war, and he pointedly declined to say whether or when more troops might be sent.In a prime-time address billed as the unveiling of his new Afghanistan strategy, Trump said the U.S. would shift away from a "time-based" approach, instead linking its