NEW YORK — What happened in Room 300 of the New York County Courthouse in lower Manhattan in November had never happened. Not in the preceding almost two and a half centuries of the history of the United States. Donald Trump was on the witness stand. It was not unprecedented in the annals of American jurisprudence just because it was a former president, although that was totally true. It was unprecedented because the power dynamic of the courtroom had been upended — the defendant was not on defense, the most vulnerable person in the room was the most dominant person in the room, and the people nominally in charge could do little about it.

It was unprecedented, too, because over the course of four or so hours Trump savaged the judge, the prosecutor, the attorney general, the case and the trial— savaged the system itself. He called the attorney general “a political hack.” He called the judge “very hostile.” He called the trial “crazy” and the court “a fraud” and the case “a disgrace.” He told the prosecutor he should be “ashamed” of himself. The judge all but pleaded repeatedly with Trump’s attorneys to “control” him. “If you can’t,” the judge said, “I will.” But he didn’t, because he couldn’t, and audible from the city’s streets were the steady sounds of sirens and that felt absolutely apt.

“Are you done?” the prosecutor said.

“Done,” Trump said.

He was nowhere close to done. Trump’s testimony if anything was but a taste. (In fact, he said many of the same things in the same courtroom on Thursday.) This country has never seen and therefore is utterly unprepared for what it’s about to endure in the wrenching weeks and months ahead — active challenges based on post-Civil War constitutional amendments to bar insurrectionists from the ballot; existentially important questions about presidential immunity almost certainly to be decided by a U.S. Supreme Court the citizenry has seldom trusted less; and a candidate running for the White House while facing four separate criminal indictments alleging 91 felonies, among them, of course, charges that he tried to overturn an election he lost and overthrow the democracy he swore to defend. And while many found Trump’s conduct in court in New York shocking, it is in fact for Trump not shocking at all. For Trump, it is less an aberration than an extension, an escalation — a culmination. Trump has never been in precisely this position, and the level of the threat that he faces is inarguably new, but it’s just as true, too, that nobody has been preparing for this as long as he has himself.

Trump and his allies say he is the victim of the weaponization of the justice system, but the reality is exactly the opposite. For literally more than 50 years, according to thousands of pages of court records and hundreds of interviews with lawyers and legal experts, people who have worked for Trump, against Trump or both, and many of the myriad litigants who’ve been caught in the crossfire, Trump has taught himself how to use and abuse the legal system for his own advantage and aims. Many might view the legal system as a place to try to avoid, or as perhaps a necessary evil, or maybe even as a noble arbiter of equality and fairness. Not Trump. He spent most of his adult life molding it into an arena in which he could stake claims and hunt leverage. It has not been for him a place of last resort so much as a place of constant quarrel. Conflict in courts is not for him the cost of doing business — it is how he does business. Throughout his vast record........

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