Talk in G.O.P. Turns to a Stop Donald Trump Campaign

Yet after committing hundreds of millions of dollars to shape the Republican primary contest and groom a candidate who can retake the White House, the conservative donor class is finding that money — even in an era of super PACs and billion-dollar presidential campaigns — is a devalued currency in the blustery, post-policy campaign fashioned by Mr. Trump, driven not by seven-figure advertising campaigns but by Twitter feuds and unending free publicity.

.. Andy Sabin, a New York supporter of Jeb Bush, said the question of what to do about Mr. Trump had come up repeatedly on the Hamptons fund-raising circuit this summer, as what seemed like a summer romance by disenchanted conservatives blossomed into a full-blown insurgency.

.. The cost of an anti-Trump campaign would be daunting: Reshaping opinions about Mr. Trump, a candidate with universal name recognition and a knack for garnering free airtime and column inches, could cost as much as $20 million. A sustained campaign aimed at Fox News viewers could cost $2 million a week, one Republican consultant working for a rival candidate estimated, while a more targeted effort, aimed at Iowa caucus-goers later this fall, would require as much as $10 million.

.. Allies of Mr. Bush, arguing that Mr. Trump helps the former Florida governor by stealing voters and attention from other anti-establishment candidates, remark that perhaps donors to Senator Ted Cruz of Texas, or Gov. Scott Walker of Wisconsin, might take the lead in financing a Trump takedown.