Looking at it objectively, the fact that he cannot be expected not to lie at every opportunity actually is his best defence. I did some freelance interpreting years ago in the courts, mainly for cases involving gangs involved in various kinds of crime. They almost always lied about everything, not just the direct lies you might expect, but everything and anything. Everything was a lie. It was pretty effective in almost endlessly extending the legal process as they even lied to their own counsels, so whatever they said would be contradicted and the case would be adjourned (again). Trump employs the same tactic - he lies to such an absurd degree the normal legal process is thrown into confusion. He wins cases, or at least avoids outright convictions, in this way. It’s pretty effective.