The most concerted effort is Trump Card LLC, the self-styled guerrilla campaign being launched by Liz Mair, the former online communications director of the Republican National Committee.
"In the absence of our efforts, Trump is exceedingly unlikely to implode or be forced out of the race," according to the Trump Card memo. "The stark reality is that unless something dramatic and unconventional is done, Trump will be the Republican nominee and Hillary Clinton will become president."
So in short, this is **not**, as Trump tweets, "GOP getting ready to treat me unfairly." This is reportedly one **former** GOP operative preparing to launch a campaign, funded by **some** donors. Contrary to Trump's tweet, this is **not** an official campaign by the Republican Party.
And the irony, of course, is that Trump is whining about being treated unfairly, while he goes about slamming his rivals, e.g., comparing Carson to a child molester. Karma, Donny.
That was my point. This is not the party itself doing this. Trump can’t expect the Party to either support or defend him from primary attacks. If he leaves the party over this attack then he has broken his pledge. He only would be justified if the party itself was doing this.