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Trump Grand Jury Could Hear From Critic of Prosecution’s Star Witness
The grand jury considering the hush-money case against Mr. Trump might hear the testimony of lawyer Robert J. Costello, a critic of the ex-president’s fixer.

A Manhattan grand jury that is expected to vote soon on whether to indict Donald J. Trump may hear testimony Monday attacking the prosecution’s star witness, according to people with knowledge of the matter.

The testimony would come from a lawyer, Robert J. Costello, who would appear at the request of Mr. Trump’s lawyers, the people said. Mr. Costello was once a legal adviser to Michael D. Cohen, Mr. Trump’s former fixer, who has been a key witness for the Manhattan district attorney’s office.

Mr. Costello and Mr. Cohen had a falling out, and Mr. Costello would appear solely to undermine Mr. Cohen’s credibility, the people said.

Under New York law, a person who is expected to be indicted can request that a witness appear on his or her behalf. Mr. Trump’s lawyers have asked that Mr. Costello testify, but the final decision rests with the grand jury; it is unclear whether they have made a decision. The grand jury has been hearing evidence about the former president’s involvement in a hush money payment to a porn star.