Remember in the beginning Trump got caught lying or trying to get Mueller to pledge his loyalty and Republicans said, "oh he doesn't know any better because he's not a politician". Well first of all, he should know better. 2nd of all, ignorance of the law is no excuse. They didn't like it when Hillary said she didn't know any better when she used a private email.He hasn't lied under oath because his lawyers are scrambling to keep him from being deposed. If he's ever forced to, you can count on it happening, because he doesn't know the difference between a lie and the truth. He's used to being the ultimate boss and having whatever he says considered gospel.He hasn't done it under oath and he hasn't used his office to obstruct justice.Is it any better that trump lies to us daily?
So ultimately it comes down to this. We all know Trump colluded with Russia. In his mind "they all do it". In his mind Obama and crooked Hillary were cheating so it was ok that he cheats/lies and even breaks a few laws.
Perfect example is how Kelly Ann Conway broke the law and didn't even get a slap on the wrist. She broke the law campaigning for Roy Moore and she broke the law peddling Ivanka's clothing line.