Special counsel David Weiss, who has run a more than five-year federal investigation into first son Hunter Biden, appeared Tuesday before the House Judiciary Committee to answer questions about the probe.

“Special Counsel Weiss is appearing voluntarily to testify before the House Judiciary Committee about the scope of his authority,” Weiss spokesman Wyn Hornbuckle said in a statement.

“Mr. Weiss is prepared to take this unprecedented step of testifying before the conclusion of his investigation to make clear that he’s had and continues to have full authority over his investigation and to bring charges in any jurisdiction.

“Consistent with department policy and the law, he will be unable to address the specifics of his investigation. At the close of this matter, Special Counsel Weiss will prepare a report, which the Attorney General has committed to making public to the greatest extent possible, consistent with the law, department policy and the public interest.”

Weiss’ appearance comes months after congressional Republicans first sought answers about the degree of authority he exerted over the Hunter probe — and whether President Biden’s Justice Department improperly interfered in the case.

Two IRS whistleblowers — Special Supervisory Agent Gary Shapley and Special Agent Joseph Ziegler — testified before the House Ways and Means and House Oversight committees that the investigation was “slow-walked.”

US attorneys appointed by President Biden for Washington, DC, and Los Angeles declined to assist in bringing charges, but letters from Weiss and sworn congressional testimony from Attorney General Merrick Garland argued that the Delaware US attorney was given “ultimate authority.”

The whistleblowers, Justice Department officials, other IRS officials and those US attorneys — Matthew Graves and Martin Estrada — have all since testified that Weiss needed to partner with prosecutors to bring a case outside Delaware and had to get a final sign-off on charges from the DOJ’s Tax Division.

The whistleblowers also alleged that Weiss’ team in Delaware had blocked investigators from taking certain steps to develop their tax fraud case against the first son — and discouraged lines of inquiry that could lead to the president.

Shapley and Ziegler were initially interviewed behind closed doors weeks before Weiss slapped the president’s son with a probation-only plea deal on June 20 for two misdemeanor tax crimes.

It also allowed Hunter to enter into a diversion agreement for having lied on a federal gun purchase form about his drug use in 2018, when he was heavily addicted to crack cocaine, according to his 2021 memoir, “Beautiful Things.”

But the “sweetheart” deal, as Republicans called it, blew up in federal court on July 26 under persistent questioning from US District Judge Maryellen Noreika.

The judge pressed federal prosecutors and Hunter’s defense team about a provision contained in the diversion agreement that would have granted the first son sweeping immunity from charges related to his overseas business dealings.

But the “sweetheart” deal, as Republicans called it, blew up in federal court on July 26 under persistent questioning from US District Judge Maryellen Noreika.

That immunity would have guarded against potential charges of money laundering and violating the Foreign Agents Registration Act, with Hunter’s family and his associates raking in $17.3 million between 2014 and 2019.

Garland elevated Weiss to special counsel to complete the investigation on Aug. 11, and the prosecutor’s office withdrew its tax indictment in Delaware. Weiss is expected to bring further charges in another jurisdiction.

Prosecutors also slapped Hunter Biden with three counts for illegal possession and false statements he made when buying the Colt Cobra revolver in October 2018 — charging him for owning a weapon that the first son has said was “unloaded” and owned “for 11 days.”

In a Nov. 2 USA Today op-ed, the first son called the indictment unprecedented and said the “weaponization” of his alcohol and drug addiction “represents a real threat to those desperate to get sober.”

“My struggles and my mistakes have been fodder for a vile and sustained disinformation campaign against [President Biden], and an all-out annihilation of my reputation through high-pitched but fruitless congressional investigations,” Hunter also wrote.

The congressional investigation has included testimony from former Hunter business partner Devon Archer, who told members of the House Oversight Committee in July that the first son put his father on the phone with business associates at least 20 times.

Archer also alleged that Hunter took a position on the board of the Ukrainian natural gas company Burisma Holdings — to the tune of $1 million annually — to promote the Biden “brand” while his father oversaw US policy in Kyiv.