He has lost the formal immunities of the presidency and the legal firepower of the Justice Department, but he is also without some of the informal shields that protected him even before he was president: his reputation for endless wealth and his clout as a political donor in New York.

Now, prosecutors roam free in his financial records. New lawsuits keep arriving. Some of his key lawyers have quit. A man who once used the law to swamp his enemies, overwhelming them with claims and legal bills, is finding himself on the other side of the wave, unable to control what comes next.

Until recently, “at his level, there was no such thing as being in ‘legal trouble,’ in the way that ordinary people think about it,” said Michael D’Antonio, who wrote a 2015 biography of Trump. He said Trump usually had something he could hold over the head of his opponents: withholding donations, bad press or a messy countersuit.

Today, D’Antonio said, in the urban and liberal jurisdictions where Trump is facing the most peril, “nobody needs him now.”

“What does he have to offer anybody? And in fact there’s every incentive to crush him,” D’Antonio said.