"You want to have World War III and destroy the party?"

“Ridiculous — not happening,” said one Rules Committee member, asked about the prospect of candidates getting on the ballot who did not run this year.

“There’s no way in hell that any of these candidates — who have worked this hard and spent this much money — are going to say, ‘OK, now, for the good of the party, I’ll sit down and let’s bring back Mitt Romney,'” said the insider. “That’s a fantasy world — there’s zero chance of that happening.”

Another committee member said creating a path for a new candidate would lead to a party meltdown.

“Change the rules drastically you will have a problem,” said the insider, who requested anonymity to discuss controversial convention scenarios. “You want to have World War III and destroy the party?”