Paul Waldman: GOP unity behind Trump is cracking, and divisions could widen

Support for President Donald Trump among congressional Republicans has been all but absolute over the past two years. But there's a drama playing out right now over his declaration of a national emergency to divert funds to border wall construction that portends a more complicated 2020 for the president and his allies.If rifts are developing in that relationship, it could lead to a spiral in which members of Congress see it in their interests to separate themselves from the president, and in res