Gordon Cleveland, the gun store clerk who sold Hunter Biden the firearm at the center of the case, returned to the stand.

Cleveland was being cross-examined by the defense after testifying for the prosecution yesterday.

Hallie Biden, Hunter Biden's former romantic partner who is the widow of his brother Beau Biden, is expected to be the next witness following Cleveland.

Court resumed this morning with a sidebar conference.

Prosecutors and defense attorneys were arguing before the judge about an exhibit the defense wants to introduce when Hallie Biden, Hunter Biden's former romantic partner, takes the stand as expected later today.

Separately, defense attorney Abbe Lowell signaled his intention to file a motion to have the case thrown out after the government rests.

The long-shot bid will be filed on grounds of constitutional shortcomings and insufficient evidence, Lowell said.

Lowell also said his witnesses -- which could include President Joe Biden's brother James Biden and Hunter Biden's daughter Naomi Biden -- may not be available until Friday morning.

Hunter Biden has arrived at the Wilmington courthouse for today's proceedings.

Like previous days, he was accompanied by his wife, Melissa Cohen Biden.

The gun store clerk who sold Hunter Biden the handgun at the center of the government's case returns to the witness stand this morning on Day 4 of the trial as prosecutors look to wrap up their case against the president's son.

Prosecutors said at the end of Wednesday's proceedings that they plan to call six more witnesses -- including Hallie Biden, perhaps their most crucial witness -- before resting their case, which could happen as soon as this afternoon.

Defense counsel have leaned into their claim that Hunter Biden was not actively abusing drugs in October of 2018, the month of his gun purchase, and therefore did not knowingly lie on the federal firearm application form.

Zoe Kestan, one of Hunter Biden's ex-girlfriends, testified Wednesday that she witnessed him smoking crack the month before and the month after his gun purchase, but had "no idea" what he was doing in October.

To fill that gap, prosecutors plan to call Hallie Biden, his brother's widow with whom Hunter Biden was romantically involved.

"The evidence will show that during those 11 days, the defendant continued to use drugs and to talk about his drug use with Hallie," prosecutor Derek Hines said.

Judge Maryellen Noreika has so far quizzed more than 50 Delaware residents about their fitness to serve as jurors in the first trial of a sitting president's son. And being Delaware -- a small state that Joe Biden represented in the Senate for more than three decades -- nearly all of them had some level of familiarity with Hunter Biden's legal travails.

"I live in Delaware," one prospective juror said. "You can't swing a cat without hearing something."

"Delaware is a small place," another said. "So you hear stuff."

Several jurors said they had heard or read about this trial specifically. Most had only a cursory understanding of the case, but others expressed a detailed accounting of the charges. A few jurors mentioned the ill-fated plea deal that Hunter Biden initially struck with prosecutors last summer.

"At one time there was a deal, and then there wasn't," one man said.

One woman had even read Hunter Biden's memoir, "Beautiful Things," which prosecutors plan to use to help prove their case. She was excused by the judge.

President Joe Biden has emerged repeatedly in questioning, with prospective jurors expressing both positive and negative feelings on his presidency. One woman said she believed that Hunter Biden was facing charges largely because his father is the president.

"I think it was a very strong factor," she said.

Several others have been dismissed for harboring negative views toward the Bidens. Asked for his opinion about the president, one man said, "Not a good one." Another man said, "Negative toward the defendant." Both were excused.

The jury questionnaire also includes several questions about drug and alcohol addiction -- an affliction that many prospective jurors said has personally affected them.

One woman held back tears as she described how her best friend had died of a heroine overdose. Another man said his daughter is a recovering addict.

"Everybody needs a second chance," he said.

Judge Noreika has been pressing ahead, intent on getting a jury seated as soon as possible -- perhaps even by the end of the day.

In addition first lady Jill Biden and Hunter Biden's wife Melissa, his half-sister Ashley Biden attended court during the morning session, and his confidant and financier Kevin Morris is also in attendance.