Judge Merchan has begun hearing arguments about the admissibility of some defense exhibits, including an email communication between Michael Cohen and his one-time attorney Bob Costello's law partner Jeffrey Citron.

Defense attorney Todd Blanche argued that the exhibit could be used to impeach Cohen's testimony.

Judge Merchan said he will not allow the email into evidence. Prosecutors argued that the email was hearsay and cannot fairly offer a window into Cohen's state of mind.

"There is another layer there of hearsay," Merchan said about the email. "I don't see any probative value for impeachment purposes here at all."

"Good morning Mr. Trump," Judge Juan Merchan said as he gaveled in the proceedings.

"It's become apparent that we are not going to be able to sum up tomorrow," the judge said after taking the bench.

Merchan said it's more likely summations will take place next Tuesday, after procedural matters and the Memorial Day break.

"Either have a long break now or a long break then, and unfortunately the calendar is what it is," the judge said.

Prosecutors have entered the courtroom for Day 19 of the trial.

Trump has arrived with his entourage.

Before entering, the former president addressed reporters but ignored their questions about whether he'll testify in the trial.

Donald Trump's former attorney Michael Cohen returns to the witness stand this morning for the final time before prosecutors rest their case against the former president in his criminal hush money trial.

Prosecutors could rest their case later this morning.

Defense attorneys have not yet declared who they plan to call to testify -- including whether Trump will testify in his own defense.

Cohen, the prosecution's last major witness, is expected to complete his cross-examination by Trump's defense team before lunch.

Proceedings are scheduled to get underway at 8:45 a.m. ET with arguments over the admission of additional exhibits, after which the jury is expected back in court at 9:30 a.m.

Defense witness Robert Costello, who for a time was Michael Cohen's attorney, introduced details of his first meeting with Cohen, saying they first met at the Regency Hotel in Manhattan on April 17, 2018, with attorney Jeffrey Citron.

Cohen "was absolutely manic" during the first meeting, Costello said. The FBI had just raided his home and office.

“I really want you to explain what my options are. What’s my escape route?” Costello said Cohen told him.

Cohen said, "My life is shattered, my family's life is shattered," Costello testified.

Costello said he told Cohen, “This entire legal problem he was facing would be resolved by the end of the week if he had truthful information about Donald Trump and cooperated with the Southern District of New York.”

Costello said that Cohen on multiple occasions said, “I swear to god Bob, I don’t have anything on Donald Trump.”

"Did the topic of Stormy Daniels come up?" defense attorney Emil Bove asked Costello.

Costello said it did, with Cohen telling him, "I don’t understand why they’re trying to put me in jail for some f------ NDAs."