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A custodial witness who testified yesterday about the contents of former Trump attorney Michael Cohen's phone is scheduled to return to the witness stand this morning on Day 11 of the trial.

Douglas Daus, who handles the processing of electronic devices for the Manhattan district attorney's office, told jurors what he found when he extracted the contents of Cohen's two iPhones -- including a September 2016 recording of Donald Trump discussing the arranged purchase of Karen McDougal's story that was made public in 2018.

Daus also testified that Cohen had nearly 40,000 contacts on one of this phones, including 10 pages of contact information s for Trump alone.

Speaking to reporters outside the courtroom, former President Trump signaled that he might not be taking the stand in the trial in response to a question about what he thought of Keith Davidson's testimony.

"I'm not allowed to testify because this judge who's totally conflicted has put me under an unconstitutional gag order. Nobody's ever had that before," Trump said, despite the limited gag order only keeping him from directing prohibited comments at witnesses, jury members, and attorneys in the case.

"The easiest question so far," Trump told reporters, "but I'm not allowed to testify because this judge is totally conflicted, has me under an unconstitutional gag order."

-ABC News' Kelsey Walsh and Mike Pappano

In his cross-examination of expert witness Douglas Daus, defense attorney Emil Bove asked Daus why the 2016 Trump-Cohen recording on Cohen's phone abruptly cuts off, attempting to raise doubts about the integrity of the recording.

Daus suggested that he heard in the recording that another call was coming in, but Daus said he could not say with certainty why the recording ended.

"You don't have firsthand knowledge of why it cuts off?" Bove said.

Bove -- a former prosecutor with plenty of experience handling cellphone extractions -- then discussed with Daus the different ways to extract a device. For a brief moment, the tone of the cross-examination shifted from tense to friendly.

Judge Merchan subsequently ended the proceedings for the day, dismissing the parties.

The proceedings are scheduled to resume tomorrow at 9:30 p.m. ET.

Expert witness Douglas Daus testified about a recording on Michael Cohen's phone from Sept. 6, 2016, at 10:56 a.m.

The recording, approximately two minutes long, captures a conversation between Cohen and Trump.

"I need to open up a company for the transfer for all of that info regarding our friend David," Cohen says on the call. "I am all over that, and I spoke to Allen about it when it comes time for the financing," Cohen says.

"What financing?" Trump asks.

"We'll have to pay him something," Cohen said.

The prosecution then concluded its direct examination of Daus.

On cross-examination, defense attorney Emil Bove sought to raise doubts about the integrity of the material on Cohen's phone, suggesting it had been "subject to the risk of manipulation" somewhere in the chain of custody.