Internal polls set him off?
Trump's narcissistic personality disorder has never adjusted to people who do not worship the ground he walks on. Trump is accustomed to bullying the weak and getting praise from the sycophants with which he surrounds himself. Cruz has highlighted that Donald's values are not the media image that Trump has crafted and not consistent with the conservative base. Trump feels insecure and exposed so he is going on a twitter tirade. He knows on substance he is not the superior candidate so he has adopted Alinski tactics and personal attacks. It is unfortunate that his personal attacks are indicative of the values dissonance, Cruz spotlighted.
He doesn’t do internal polls.