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.

Throughout his cross-examination this morning, defense attorney Todd Blanche has attempted to legitimize the repayment arrangement between Trump and Cohen in 2017.

Prosecutors have argued that Trump falsified business records by describing a reimbursement for the Stormy Daniels payment and other expenses as payment for legal services pursuant to a retainer agreement, even though Cohen never had a retainer agreement with Trump.

Blanche emphasized all the legal work that Cohen did for Trump and his family in 2017. He also showed the jury an email from Allen Weisselberg, where he requested Cohen to "please prepare the agreement we discussed so we can pay you monthly."

Amid frequent objections, Blanche has referenced the "agreement" mentioned above as a "retainer agreement," though Cohen never had a formal retainer agreement with Trump.

Pursuant to the "agreement," Cohen said he received nine checks directly from Trump in 2017.

"That would have been nine checks -- 35,000 a piece," Cohen said.