His idea has always been that why not use media polls so that he can save money for himself. He repeatedly said it proudly in interview and rallies. Because he know he run his campaign cheap, he doesn't gave a damn to internal polling. This sharing polling data is pure BS if you really follow 2016 election.
But the main point here is the reason why Trump fires Paul Manafort is because of his Ukraine work, nothing else. Manafort made a successful convention for Trump, but he still got fired right after convention. It's because his controversial Ukraine lobby work. This is actually a powerful proof of no Russia collusion.
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