Hunter Biden's daughter Naomi took the stand as the defense's third witness.

Jason Turner, an employee at the gun shop that sold Hunter Biden the Colt revolver at the center of the case, corroborated on the stand clerk Gordon Cleveland's earlier testimony of the sequence of events that occurred in the store when Hunter Biden filled out the ATF form and purchased the gun.

Turner, who appeared defensive and confrontational during some of his testimony, testified that he never spoke to Hunter Biden.

When shown the ATF Form 4473 that Hunter Biden filled out, Turner said Hunter Biden provided his car registration as an alternate form of ID because the passport he provided did not have an address.

The defense said in court papers filed earlier that confusion over how Hunter Biden's form of ID was recorded on the ATF form raised questions about "who wrote what on the form, and when."

When defense attorney Abbe Lowell, questioning Turner, highlighted the box on the form that asks for the type of alternate ID, it was blank.

"When I wrote that out, I wrote 'car registration,'" Turner said. "It's not there," he testified.

Lowell also pressed Turner on what he was doing after Hunter Biden's background check came back until the firearm was purchased.

"I would have put on my ritual tone and sat in a marble room," Turner said sarcastically.

Ron Palmieri, the owner of the gun store, then took the stand.

As Hunter Biden's defense case gets underway, two more members of the Biden family have entered the courthouse: Naomi Biden and James Biden.

Naomi Biden is the daughter of Hunter Biden and granddaughter of President Joe Biden.

James Biden is Hunter Biden's uncle and President Biden's brother, who Hunter's attorney told the jury during opening statements paid for some of Hunter Biden's rehab and lived with him briefly afterward.

Defense attorney Abbe Lowell previously suggested both James Biden and and Naomi Biden could take the stand for the defense.

After jurors left the courtroom for a break, defense attorney Abbe Lowell moved for an acquittal for by orally submitting a Rule 29 motion, citing constitutional challenges and an insufficiency of evidence.

Judge Maryellen Noreika indicated her skepticism at the longshot bid with a chortle as Lowell described the legal underpinnings of his motion.

"You're laughing," Lowell said, before joking that her "smile" suggested she was "likely skeptical."

Both Lowell and the judge agreed that one of his claims in particular was an "interesting concept."

Lowell then told the court that the first two witnesses he plans to call for the defense are Ronald Palimere, the owner of the gun shop where Hunter Biden purchased the Colt revolver at the center of the case, and Jason Turner, an employee of the store.

Hunter Biden's former romantic partner Hallie Biden told jurors that Hunter Biden was "tired, exhausted, and looked like he hadn't slept" on the evening of Oct. 22 or early morning of Oct. 23, 2018, when he arrived at her home in Wilmington to sleep.

She observed that he "could've been" on drugs when she saw him -- just hours before she found his newly purchased Colt Cobra revolver in his car and discarded it in a dumpster.

"I went to clean out his car and his stuff" as he slept in her home, in hopes that when he awoke they could "start anew and deal with stuff," she testified, referring to his addiction to "both" drugs and alcohol.

The testimony didn't appear to be quite the smoking gun sought by prosecutors, who are trying to prove Hunter Biden was using crack at the time of his firearm purchase on Oct. 12 -- one of the central questions in the case.

Hallie Biden, who is the widow of Hunter Biden's late brother Beau Biden, testified that earlier in 2018 she also became addicted to crack after Hunter Biden introduced her to the drug -- but that she is now clean.

"It was a terrible experience I went through," she said, adding that she was "embarrassed and ashamed, and I regret that period of my life."