From Jonathan Topaz and Daniel Strauss writing at Politico:

All jokes aside, the Republican Party is officially afraid of Donald Trump.

He has virtually zero chance of winning the presidential nomination. But insiders worry that the loud-mouthed mogul is more than just a minor comedic nuisance on cable news; they fret that he’s a loose cannon whose rants about Mexicans and scorched-earth attacks on his rivals will damage the eventual nominee and hurt a party struggling to connect with women and minorities and desperate to win.

“Donald Trump is like watching a road-side accident,” said former George W. Bush press secretary Ari Fleischer. “Everybody pulls over to see the mess. And Trump thinks that’s entertainment. But running for president is serious. And the risk for the party is he tarnishes everybody.”

Those risks were amplified this week after a trio of polls showed him likely to earn a coveted invitation to the party’s debates, which ironically were restructured with the very goal of avoiding the circus-like atmosphere of 2012. Having Trump introduce the 2016 field to a national audience was not exactly the Big Tent the party’s bigwigs had in mind.