Defense attorney Todd Blanche opened today's questioning by asked Cohen about his communication with reporters.

"Since that time [when your last testimony ended], how many reporters have you talked to?" Blanche asked.

Cohen said he's spoken to reporters "who called to say hello, to see how I'm doing," but that he didn't talk about the case.

"Didn't speak at all about your testimony last week?" Blanche asked.

"Correct," Cohen responded.

As Cohen resumed his testimony, jurors appeared attentive, with several taking notes. Trump sat slouched at his chair with his eyes closed.

Following the break, former Trump attorney Michael Cohen has entered the courtroom.

He took his seat in the witness box to resume his cross-examination as Trump looked on.

Defense attorney Todd Blanche asked to approach the bench about an ongoing discovery issue.

Both legal teams leaned in as Blanche spoke to the judge.

With the sidebar completed, the judge called for a ten-minute break.

Judge Merchan denied a request from defense lawyers to broaden the scope of testimony from their expert witness Bradley Smith, who is an expert on campaign finance regulations.

On Thursday, defense lawyers asked Merchan to allow Smith to testify about various terms related to federal campaign finance laws. Merchan denied the request, citing long standing precedent prohibiting witness testimony about the law.

"An expert is not permitted to present or interpret the law," Merchan said.

Merchan also expressed concerns about Smith's testimony prompting a "battle of the experts" between Smith and an expert called by prosecutors, which Merchan said would confuse the jury.

Merchan said that Smith could still testify, as long as he follows the limits imposed in his pretrial ruling on the case's motions in limine.

"The court will monitor this testimony closely to ensure full compliance," Merchan said in a pretrial ruling. "Any deviation from this ruling could result in sanction up to and including striking the expert's entire testimony."

Trump, sitting at the defense table, shook his head after the judge announced his ruling.

In a sidebar, Trump's attorney told Judge Merchan want to use ex-Cohen attorney Robert Costello to push back on Cohen's claims that he was worried about speaking to Costello because he was worried it would get back to Trump.

"That's not Mr. Costello's recollection," defense attorney Emil Bove said. "To rebut the government's pressure campaign theory -- that's why this evidence is admissible."

Bove told Merchan that Costello would testify that Cohen told him that Trump had no awareness of the Stormy Daniels' hush money payment.

Earlier today, Cohen testified that he lied to Costello about Trump's awareness because he did not trust Costello.

"The whole purpose was to make Mr. Trump sound threatening," Bove said.

"I don't think so," Merchan responded.

Prosecutor Susan Hoffinger argued that defense lawyers did not include Costello on their witness list or provide the exhibits related to his testimony.

"Rebutting the pressure campaign should have been part of their direct case," Hoffinger said.

Merchan called a brief recess to consider the arguments but ordered the parties to remain in the courtroom.