[sushiman]

Perhaps the backlash against The Don’s debate is because he dared to mention the Obama eligibility issue ? He refused to kiss the GOP ring and be silent about the Usurper .

[annieokie]

Could be. Then it may be that they consider Trump beneath them. Some I believe have legitimate reasons, scheduling, tours, etc., and I am sure Trump understands that, others are just afraid of him. I theorize that he will endorse from the ones that do attend his debate.

[SoJoCo]

Perhaps the backlash against The Don’s debate is because he dared to mention the Obama eligibility issue ?

Or could it be that The Donald has said that if he doesn't agree with the nominee then he could see running as an independent? Trump is a Republican when convenient, a Democrat when expedient, and an egotistical clown at all times. Why should the GOP candidates feed that?