facebook much more than their holiday pics. the controversial highly political post she is promoting and how it could impact the high court. welcome to "the lead," i'm dana bash in for jake tapper. and we begin this friday afternoon with the politics lead. a new year, a new congress fast approaching, president trump issues another shutdown threat. this time, the warning is that he may seal off the entire southern border with mexico and insisting the federal government will not reopen until he gets his billions in wall funding. day seven of the partial shutdown and neither side is giving ground. white house press secretary, sarah sanders, telling cnn the president has been in the office for the past several hours and making calls all morning. but it seems much more of his attention has been on his twitter feed. cnn's jessica dean joins me now from the white house. jessica, we learned today the president will stay in