Trump lies by or through omission which is lying by either omitting certain facts or by failing to
correct a misconception. He hasn't ball faced lied politically though I'm sure he boasts and lies outright privately. The reason he won't apologize for anything, related to a lie, is because there's always a grain of truth surrounded by his obtusely ignorance. So he feels he did 'kinda' tells the truth giving his unstable mind no reason to apologize. Just this evening he says Comey attended a dinner that Comey requested, "maybe". The framing or shading is that Comey 'requested the dinner" when Trump actually requested it with the purpose of asking Comey for his loyalty. That makes it look like Comey did it to ask to keep his job. President Obama's connection to Kenya is distorted into "he was born in Kenya". He obviously has insecurely narcissist reasons to soothe his neurosis. I don't think Trump's daddy ever told him he 'loved' him. Or anyone for that matter. So he needs accolades on steroids for everything he does.
So..Trump is a perpetual liar. I know......duh.