In July 2023, a plea deal struck between Hunter Biden and prosecutors that could have precluded this week's trial dramatically fell apart amid the judge's concerns over the terms of the agreement.

For the better part of three hours, U.S. District Judge Maryellen Noreika scrutinized nearly every facet of the plea deal. Noreika acknowledged that her probing threw "a little bit of a curveball" into the proceeding.

Hunter Biden had originally agreed to a pretrial diversion on the gun charges, with the charges being dropped if he adhered to certain terms. He had also agreed to acknowledge his failure to pay taxes on income he received in 2017 and 2018. In exchange, prosecutors would have recommended probation on those charges.

Democrats had hailed the deal as a sign of accountability while Republicans panned the details as a "sweetheart deal."

Hunter Biden appeared stunned when the verdict was read, showing absolutely no reaction when the first "guilty" was announced.

Then, he nodded "yes" as the word guilty was read for a second time. He nodded once more when the third one was read.

Hunter Biden then immediately he turned to those around him. He patted his attorney Abbe Lowell on the back and hugged one of his paralegals, and when the jury left, he smiled as he hugged his lawyer again.

He then turned to his family, moving into the gallery where he hugged his wife and gave her a kiss.

After the reading of the verdict, Hunter Biden left court holding hands with his stepmother, first lady Jill Biden, and his wife, Melissa Cohen Biden.

His aunt and uncle, Valerie Biden and James Biden, were also at the courthouse on Tuesday.

Hunter Biden could face up to 25 years in prison, though legal experts believe he would not serve time as a first-time and nonviolent offender.

ABC News chief legal affairs anchor Dan Abrams said that while it's unlikely he will serve time, "the judge will have a lot of discretion."

"This is technically a very serious crime with a very serious potential sentence," Abrams said.

President Joe Biden told ABC News last week that he would not pardon his son. But the president also has the option to commute the sentence, Abrams noted.

In September 2023, White House press secretary Karine Jean-Pierre ruled out a commutation of any sentence.

President Joe Biden said he would not pardon his son Hunter Biden during an exclusive interview with ABC News anchor David Muir last week.

Muir asked President Biden on Thursday if he would accept the outcome of his son's trial, to which the president said, "Yes."

The president also said "yes" when asked by Muir if he would rule out a pardon for Hunter Biden.

Cross-examining gun store clerk Gordon Cleveland, defense attorney Abbe Lowell asked about the framing of the various questions on the gun form that Hunter Biden is accused of lying on -- including the difference between "have you" and "are you."

The form, for example, asks the applicant if they "have ever" been convicted -- but asks "are you" an unlawful user of drugs.

The defense team has used this to argue that Hunter Biden could have reasonably believed he was not violating any laws when he checked "No" on the drug-use box, because they say he was not currently using drugs.

"It does not say, 'Have you ever,"' Lowell said.

In court today, Hunter Biden has been attentive and focused, watching as attorneys clashed earlier over evidence. He gripped his pen as prosecutor Leo Wise asked the judge to keep out texts that his team wishes to use when they cross-examination Hallie Biden.

Special counsel David Weiss, who brought the case, has been seated in the front row behind his prosecution team, periodically nodding along as they make their arguments.