Karen Tumulty: “It used to be pretty easy to name a handful of principles that defined and united American conservatives: lower taxes, unfettered trade, smaller government and keeping that government’s hand out of private businesses.”“In ways big and small, President Donald Trump has scrambled those fundamental propositions.”“Trump’s domination of the Republican Party has allowed him leeway for a host of apostasies. He’s setting the stage, however, for what could be an epic battle over conservatism’s direction once he is off the scene. Will this turn out to be a temporary phase and a reflection of one man’s predilections, or a permanent redirection of the movement?”