Hunter Biden has arrived at the courthouse for Day 6 of his federal gun trial, accompanied by his wife Melissa Cohen Biden.

First lady Jill Biden arrived shortly afterward.

President Joe Biden's brother James Biden and sister Valerie Biden also arrived.

The two waited outside until the court opened at 8 a.m. ET.

As the second week of Hunter Biden's gun trial gets underway this morning, defense attorneys will confront their most consequential decision: whether to put their client on the witness stand.

To allow Hunter Biden to testify in his own defense would carry myriad risks, as the president's son would likely face a grueling cross-examination from a prosecution team that has shows itself adept at eliciting testimony supporting their central contention in the case -- that Hunter Biden was addicted to drugs at the time he purchased the handgun at heart of the case.

Jurors witnessed that on Friday, when Naomi Biden, the 30-year-old daughter of Hunter Biden, struggled to explain text messages she sent her father in October 2018 after he had purchased the gun -- in which she seemed to express concern about his addiction, despite testifying moments earlier about how "great" her father seemed at the time.

If Hunter Biden decides not to take the stand, jurors could possibly have the case by the end of the day, after closing arguments and jury instructions.

Court is scheduled to get underway earlier than usual today, at 8:15 a.m. E.T.

In an unexpected move, court recessed for the day following the lunch break, with the defense telling the judge they are "down to that last decision" -- suggesting that they will determine over the weekend if Hunter Biden takes the stand Monday in his own defense.

Defense attorney Abbe Lowell told the court the defense decided not to call one of its expert witnesses.

It also appears defense attorneys reversed course on testimony from Hunter Biden's uncle James Biden, who was already at the courthouse and who Lowell had earlier indicated would be testifying. James Biden was subsequently seen leaving the building.

Prosecutors said they are "still considering" whether they will put on a rebuttal case after the defense rests.

Judge Maryellen Noreika dismissed the jury, telling them to "enjoy a long weekend."

"We are starting to wrap the evidence in this case," she said.

The parties are scheduled to be back in court Monday at 8:15 a.m. ET.

Naomi Biden, the 30-year-old daughter of Hunter Biden, testified that her father "seemed great, he seemed hopeful" when she saw him on Oct. 18 or 19, 2018, in New York, where she was returning his vehicle to him -- several days after he purchased the gun at the center of the case and just days before his then-girlfriend Hallie Biden discovered and discarded it.

Earlier, in August, Naomi Biden described visiting him in Los Angeles, where he was in a drug rehab program. "He seemed the clearest I'd seen him since my uncle died," she said, referring to Hunter Biden's brother Beau Biden.

It was important testimony for the defense in their attempt to show that Hunter Biden was not using drugs around the time of the gun purchase.

Defense counsel Abbe Lowell asked Naomi Biden about the car trip she and her then-boyfriend took from Washington, D.C., to New York in mid-October 2018 to return her father's truck -- a Ford Raptor -- to him.

On cross-examination, prosecutor Leo Wise asked Naomi Biden if she ever witnessed her father using drugs -- she said she had not -- or whether she would know if he was using drugs based on his behavior.

"I guess not," she said.

Wise also established that Naomi Biden did not leave any drugs or drug residue in the vehicle before returning it to her father -- suggesting that the drug residue and paraphernalia Hallie Biden observed in the car days later arrived there after Hunter Biden retrieved the truck.

Jurors also saw some emotional text messages between Naomi Biden and her father during that mid-October timeframe.

"I'm really sad, I can't take this," she wrote her father, adding that "I really want to hang out with you."

"I'm sorry I've been so unreachable," Hunter Biden replied. "It's not fair to you."

On the stand, Naomi Biden spoke quietly, at one point saying, "Sorry, I'm nervous." Her husband, Peter Neal, sat in the gallery next to first lady Jill Biden, and had his hand over his mouth for much of the testimony.

Hunter Biden appeared emotional and was seen at times touching his face during her testimony.

When her testimony concluded, she embraced her father before leaving the courtroom, and court recessed for lunch.

Prosecutor Leo Wise, continuing his closing argument, laid out his case for conviction by telling jurors that the evidence in the case was "ugly" but "necessary" to establish Hunter Biden's drug use during the time in question -- as well as in the months before and after.

"He knew he was using drugs," Wise told the jury, a reference to the standard the jury must reach for conviction -- that Hunter Biden had to "knowingly" lie on the gun-purchase form on which he said he was not addicted to drugs.

"That's what the evidence shows," Wise said.

Wise emphasized repeatedly to the jury that the government is not required to show specifically that Hunter used drugs when he owned the gun from the Oct. 12-23, 2018 -- but rather they must "establish that pattern."

To that end, Wise referenced the text messages spanning back to 2015 in which Hunter Biden appeared to purchase drugs or reference his addiction, as well as the testimony from his ex-wife Kathleen Buhle and ex-girlfriend Hallie Biden, who said they either found his drug paraphernalia, saw him use drugs, or talked to him about it.

Wise also pointed to the testimony of ex-girlfriend Zoe Kestan, who testified she saw Hunter Biden using drugs in late September 2018 -- just two weeks before he bought the gun.

"You can convict on that alone," Wise told the jury.

Wise also referenced Hunter Biden's memoir, "Beautiful Things," saying it was a "searingly painful" but "honest" description of himself and his addiction.

The evidence showed Hunter Biden "habitually used," Wise said.