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NBC News Signal - February 14th, 2019

Sen. McConnell says Trump will sign a spending bill, but also declare a national emergency. We dig into what defines a national emergency. Amazon scraps its plans for a New York HQ2. Richard Branson says that if he could send one politician into space to give them a different perspective on earth, it would be the president. We’re live at a part of the border where there is no wall. And, in honor of Valentine’s Day, we spend some time looking at the science of love.