Hunter Biden is set to begin trial next week in Delaware on a trio of federal firearms law violations that stem from false statements he made on a federal form about his illicit drug use and addiction to unlawfully purchase and possess a revolver in 2018.

Just three days before the start of Hunter's trial, he was observed boarding Air Force One along with his father, President Joe Biden, for a return flight to Washington D.C. from Delaware, according to the New York Post.

The sighting, along with other recent circumstances, has prompted questions about the president's potential involvement in his troubled son's legal affairs.

Hunter on Air Force One

Members of the Biden family came together this week in Wilmington, Delaware, to mark the ninth anniversary of the May 2015 death of Beau Biden, the eldest son and brother of Joe and Hunter Biden, respectively, according to the Post.

Hunter and other family members hitched a ride in the presidential motorcade to a memorial service on Thursday at a church in Wilmington, then Hunter joined his father and others for a ride on the Marine One helicopter to the president's vacation home in Rehoboth Beach.

After spending the night at the beach house, the Biden family then traveled to Dover Air Force Base on Friday for the flight back to D.C., where Hunter was observed by the media boarding Air Force One with his wife and young son.

The Post noted that guests of the president typically board the executive jet early to avoid being seen by the media, though that doesn't appear to have been the case in this instance.

Hunter was also at recent White House State Dinner

National Review reported that less than a week earlier, Hunter Biden was a guest at the White House State Dinner for the president of Kenya -- an event also attended by Attorney General Merrick Garland, who is the head of the Justice Department that is prosecuting the president's son on federal gun charges.

Garland, in fact, elevated lead prosecutor U.S. Attorney David Weiss, a holdover from the Trump administration, to special counsel status, ostensibly to assure the nation that Weiss had full prosecutorial authority following allegations from whistleblowers of governmental interference and misconduct in the years-long investigation of Hunter.

It was also noted by National Review that on the same evening as the State Dinner, President Biden reportedly paid a surprise visit to his former daughter-in-law Hallie Biden, the widow of Beau who subsequently dated Hunter and is expected to testify in his upcoming trial next week.

The timing of that visit just a week before the trial struck many as suspicious, but the White House has insisted that the president only spoke to Hallie about the anniversary of Beau's 2015 death.

Prosecutors have overwhelming evidence of Hunter's guilt

According to a trial brief submitted nearly two weeks ago by Special Counsel Weiss, Hunter Biden faces three felony charges that include making a false statement about his illicit drug use on the ATF Form 4473 and his illegal possession of a firearm as an unlawful addict of a controlled substance.

The evidence in the case is overwhelming, as Hunter has openly admitted in his book, interviews, and text messages plus photos and videos that he was addicted to crack cocaine at the time he purchased and possessed the firearm, a Colt Cobra .38SPL revolver, in October 2018. A white powdery residue that tested positive for cocaine was also found on the handgun's case.

Hallie Biden, as Hunter's ex-girlfriend, along with his ex-wife, Kathleen Buhle, are expected to testify on behalf of the prosecution about their intimate knowledge of Hunter's crack addiction around the time he lied to purchase the firearm. Hallie may also testify about her role in discovering and discarding the gun about a week after Hunter illegally purchased it.