Good, let him run 3rd party. Better he does it now and implodes before he does any damage to whoever the real GOP nominee will be.
No one has a constitutional right to join any political party. Your application can be rejected. If you are allowed to join and use the parties infrastructure, the very least they should expect of you is that you support the eventual nominee and not run against them.
Don’t like it? Leave the party and go make your own party. Heck, there are 50+ third parties already - Trump has plenty he can join.
and use the parties infrastructure,
“... the very least they should expect of you is that you support the eventual nominee and not run against them.”
I agree, except that the GOPe doesn’t play by these rules. Remember Cochran’s race last election? On this basis, why should Trump have to be expected to be anything other than ‘they’ are?
“before he does any damage to whoever the real GOP nominee will be.”
So tell us all, just “whoever is the real GOP nominee?” Inquiring minds want to know! Oh, I know, ABT, right!
Trump has previously requested, and was denied, access to GOP mailing lists.