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.

Donald Trump said Wednesday that he didn't take the stand in his hush money trial because he didn't agree with the judge's rulings -- and because he was seemingly worried about information that could have come out during cross-examination.

"He made rulings that makes it very difficult to testify," Trump said in an interview on WABC Radio, referring to Judge Juan Merchan. "Anything I did, anything I did in the past, they can bring everything up, and you know what, I've had a great past -- but anything."

"The other reason is because they have no case," Trump said. "In other words, why would -- why testify when they have no case?"

Trump had originally indicated he would testify, saying on April 12 that "I would testify, absolutely." But he subsequently appeared to back away from the idea, falsely telling reporters on May 2 that the limited gag order in the case -- which prohibits extrajudicial statements about witnesses and jurors -- prevented him from testifying.

The next day in court, Judge Merchan directly addressed Trump to clarify that he has an "absolute right" to testify and that the limited gag order does not apply to his statements in court.

"I want to stress, Mr. Trump, that you have an absolute right to testify at trial, if that is what you decide to do after consultation with your attorneys," Merchan said.

-Lalee Ibssa, Soo Rin Kim and Kelsey Walsh