Yesterday the National Review published an editorial ("Against Trump") and a collection of essays ("A Donald Trump Nomination Would Fundamentally Change the GOP") criticizing Donald Trump. The editorial and some of the essays were composed of standard, inoffensive critiques that are perfectly acceptable within the Republican Party, along the lines of "Trump isn't conservative enough." But several of the essays NR chose to publish in support of its editorial crossed the line that Reagan laid down and that Republican pundits and politicians have almost universally respected until now. Those essays called Trump a racist and a would-be war criminal. And the response of the Republican Party hierarchy was swift. It disassociated itself from the National Review.