So, remove him from the Republican ticket? If he’s not a Republican, he doesn’t belong on it.
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Be careful of what you wish for. Teddy Roosevelt was a former Republican president in 1912 when he ran in the Bull Moose Party.
I could easily see Trump running third party also if he fails to win the GOP nomination.
And fail to win, giving the democrats the victory. Just like TR did.
Sure, if Trump wants to spite the country for us on martyrdom.