“If someone said: “Trump represents the liberty wing of the Republican Party. We want to make sure that we don’t allow a Communist to come in and try to defeat him.”
Would you call that a contradiction?”
No. But that is not what Rand Paul said, if you care to check back.
He said they would not allow anyone...
You would likely assume the same of anyone who opposes Trump (or anyone else you support).
We all have our favorites, and assume the worst of their opponents.