For the final stage of the prosecutor’s case in the People of the State of New York v. Donald Trump, the prosecution is expected to call the witness who has received the lion’s share of attention since the indictment was brought a year ago: Michael Cohen.

Before the trial started, some observers thought Mr. Cohen would be an indispensable star witness. They said that without Mr. Cohen, the district attorney could not establish the elements of the charged criminal offenses. But having seen…


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