Last month, Donald Trump, the presumptive Republican nominee for President, and Paul Ryan, the Speaker of the House of Representatives, met at the headquarters of the Republican National Committee, two blocks from the Capitol. Ryan, the Vice-Presidential candidate in 2012, is widely regarded in the G.O.P. as a policy intellectual and has fashioned himself as the guardian of conservative ideology. Trump, one of the most opportunistic candidates in the Party’s history, had just knocked out the last of sixteen Republicans who had, to varying degrees, campaigned on Ryan’s ideas. In July, at the Republican National Convention, in Cleveland, Trumpism’s victory over Ryanism will create a potentially humiliating moment for the Speaker, who will serve as the chairman of the Convention, which will formally nominate Trump. The candidate’s visit to Party…
