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.

Government prosecutors told jurors in the trial's opening statements that they should make "no distinction for Hunter Biden or anybody else" as they weigh the gun case against the president's son.

Hunter Biden "chose to lie," prosecutor Derek Hines said, laying out the case that the defendant purchased a gun while knowing he was an addict and drug user.

Hines said Hunter Biden bought the firearm from a gun seller who will testify as a witness that the younger Biden filled out form 4473 -- consenting to a federal background check -- and certified that he understood the form. The prosecution said it will show Hunter Biden "bought a gun and lied during a background check."

The man who sold Hunter Biden the gun will testify that he watched the defendant fill out the form.

The gun was then "taken by someone concerned he had a gun. That person was Halle Biden," Hines said, referring to Hunter Biden's romantic partner at the time.

Halle Biden disposed of the gun in a dumpster, where it was retrieved by a man who will also be a witness called by the government.

"The police were called" when Halle Biden went to retrieve the gun, Hines said.

Hines, in his opening, said evidence will show that "Hunter Biden knew he was a drug user and a drug addict" when he filled out the form.

Hines cited Hunter Biden's memoir, "Beautiful Things," in which he wrote he had a "superpower of buying crack anywhere, anytime."

In text messages presented by the prosecution, Hunter Biden acknowledged, "I am an addict."