WASHINGTON - The Trump administration's decision to let states chart their own responses to the coronavirus crisis rather than impose a national strategy will cost thousands of lives and is likely to result in an open-ended outbreak rolling across the country, a dozen public health experts told NBC News. The only way to win what President Donald Trump has called a war against an "invisible enemy" is to establish a unified federal command, the experts insist - something Trump has yet to do. So far, the federal government hasn't leveraged all its authority and influence to dramatically expand testing and...