The Stop-Trump fever that gripped the Republican establishment for months has broken.The walls are closing in around a shrinking band of hardcore opponents of the New York billionaire, who is tightening his grip on the Republican presidential nomination with big wins in state after state, congressional endorsements, and the acknowledgement from pillars of the GOP elite that Donald Trump will be the party’s standard bearer.There was grizzled RNC committeeman Ron Kaufman likening Trump to Reagan.