It is a trial and Trump can present a defense. That is what makes America great. Innocent until proven guilty. There are 38 counts of indictment that he will have to beat.
Trump will prove how he can Make America Great Again by beating all charges. If your rich you can beat it is what makes America Great. If your poor well then they can assign a public defender. Two of his lawyer have recently quit. His aide is also on trial. Will the aide dive on that grenade or be offered a plea deal? Can Trump keep his mouth shut and let his lawyers do the talking?
His comment, "I never thought it possible that such a thing could happen to a former president of the United States," is strange as he seems to be saying because he was a former president that this should never have happen. Hardly a legal point that his lawyers will be mentioning during the trial.
Conspiracy to obstruct, willful retention of documents and false statements. conspiracy to obstruct, willful retention of documents and false statements, I really can not see how he can beat any of those. The documents are in his possession and some mumble jumble that he declassified them will be used against him as mishandling sensitive documents.
He was asked specifically to turn these documents over and obviously he refused.