Trump has no concept of truth. For Trump, words have always just been tools for manipulating people. He has no direct contact with reality - he just gives orders to his servants and toadies and things magically happen. Trump doesn't think in terms of right and wrong or true and false - he just thinks "I want that" or "I don't want that."
Trump said, "Putin....mentioned the "n-word....Number one, he doesn't like him; and number two, he doesn't respect him. I think he's gonna respect your President if I'm elected, and I hope he likes me."
Donald Trump's praise for Vladimir Putin (at CNN Politcs)