Trump was asked about Rand the other day, and Trump was gentle and agreed with Rand not to sit at the kid table because he was due more respect then that. So why does Rand come out slugging at Trump on CNN today, when he should have been going after Reince Prevous and Butthead, head of the GOP instead? Rand is picking the wrong f'king adversaries.
And a couple days before that (and probably many times before and after) Trump was mocking Rand for threatening to sit out during one of his rallies. So no, he isn't an ally to Rand, he's probably hoping he can pick up some Rand/Ron supporters.