After several hours of arguments over various evidentiary and procedural matters, jury selection is nearly ready to get underway.

"This is what we're going to do -- sit down and relax," Judge Merchan told attorneys for both sides. "We have 500 jurors waiting for us. And to be honest with you, I'm not interested in getting into this minutiae with you."

"There's more important work to be done," he said.

Before moving on, Merchan assured attorneys for both parties that his pretrial rulings are subject to change over the course of the trial.

"This is a roadmap," Merchan said, referring to his rulings. "I can reverse myself, I can change my mind."

Merchan then began reading instructions to the attorneys about how to conduct themselves before prospective jurors.

After a break, Judge Merchan ruled that prosecutors can submit evidence related to Trump's attacks on his former attorney Michael Cohen if the defense first chooses to question Cohen's credibility as a witness.

Merchan said, "I imagine" the defense will seek "to discredit" Cohen -- and when they do, he said, "the door is open" for prosecutors to introduce those tweets of Trump's.

Trump has been leaning forward with his hands clasped beneath his chin as his attorney, Todd Blanche, argues about what other evidentiary guardrails should be in place.

Following the arguments over alleged witness intimidation, prosecutors signaled they may seek to have Trump held in contempt.

A limited gag order Judge Merchan imposed in recent weeks prohibits Trump from attacking witnesses and others associated with the case.

"Shortly, we will be seeking order to show cause as to why defendant should not be held in contempt," prosecutor Josh Steinglass said, suggesting Trump violated Merchan's order.

Prosecutor Joshua Steinglass argued that several pieces of evidence related to Trump's alleged "pressure campaign" meant to "keep witnesses off this stand, at this trial" should be introduced at trial.

Steinglass said Trump's public commentary amounted to a "thinly veiled effort to intimidate" two of the government's star witnesses, Michael Cohen and Stormy Daniels.

"The defendant himself has publicly embraced the public strategy of going after his perceived enemies," Steinglass said.

"These tweets, phone calls and emails" should be permitted, Steinglass said. "It's a clear effort to raise the cost of cooperation."

Trump's public postings, Steinglass argued, demonstrate Trump's attempts to silence potential fact witnesses and "relate to his consciousness of guilt."

Trump attorney Todd Blanche pushed back, saying that Trump has been "facing criticism from all sides … the media and others ... and he's defending himself" to his "millions and millions of followers."

Former National Enquirer publisher David Pecker described one of the most heated moments so far during the catch-and-kill arrangement between him, Donald Trump and Trump's then-attorney Michael Cohen.

When Cohen approached Pecker with a plan to reimburse the National Enquirer for buying the exclusive rights to Karen McDougal's story, the two men drew up paperwork in which Cohen would repay the Enquirer's parent company, AMI, through a shell company he created, Pecker said.

But Pecker testified that he had a change of heart after consulting with his general counsel.

"I called Michael Cohen and I said to him that the agreement we signed -- the deal was off. I am not going forward, it is a bad idea," Pecker testified. "I want you to rip up the agreement."

"He was very, very, angry. Very upset, screaming basically at me. And I said, I'm not going forward with this agreement, rip it up," Pecker said.

Pecker said Michael Cohen then brought up "the boss."

"And Michael Cohen said, the boss is going to be very angry with you. And I said, I'm sorry, I am not going forward. The deal is off," Pecker recounted. "And he said, I can't believe it. I'm a lawyer, I'm your friend. I don't understand why you're not going forward. I said I am not going forward. Period."

Pecker previously described at length that he was aware that the National Enquirer's payment to Karen McDougal in order to catch and kill her story for the benefit of Trump's campaign would amount to an illegal campaign contribution -- softening his tone when he testified to this.