WASHINGTON — The criminal charges against Hunter Biden “were the culmination of thorough, impartial investigations, not partisan politics,” the prosecutor who led the probes said in a report released Monday that sharply criticized President Joe Biden for having maligned the Justice Department when he pardoned his son.

“Other presidents have pardoned family members, but in doing so, none have taken the occasion as an opportunity to malign the public servants at the Department of Justice based solely on false accusations,” said the report from special counsel David Weiss, whose team filed gun and tax charges against the younger Biden that resulted in felony convictions that were subsequently wiped away by a presidential pardon.

The report is the culmination of years-long investigations that predated the arrival of Attorney General Merrick Garland but became among the most politically explosive inquiries of his entire tenure, capturing Republican fascination on Capitol Hill and ultimately producing a fissure between the Justice Department and the White House over the treatment of the president’s son.

The document, as is customary for reports prepared by Justice Department special counsels, provides a recap of the investigative findings. But it is most notable for its steadfast defense of the team’s work and for its open criticism of the president over a written statement he issued when pardoning his son last month.

Biden had repeatedly pledged that he would not pardon his son but reversed course on Dec. 1, saying that such an action was warranted because of what he called a “miscarriage of justice” and a selective prosecution. He said he believed that his son had been treated “differently” on account of his last name and that “raw politics” had infected the decision making of the Justice Department.

“No reasonable person who looks at the facts of Hunter’s cases can reach any other conclusion than Hunter was singled out only because he is my son — and that is wrong,” Biden said.

Weiss, who served as U.S. attorney for Delaware during the Trump administration and was kept in his position by Garland before being named to the role of special counsel in 2023, took exception to those comments and noted that judges had rejected that assessment as well.

“The president’s characterizations are incorrect based on the facts in this case, and, on a more fundamental level, they are wrong,” Weiss wrote. Such remarks undermine the public’s confidence in the justice system, Weiss said.

Calling judges’ rulings “into question and injecting partisanship into the independent administration of the law undermines the very foundation of what makes America’s justice system fair and equitable,” Weiss wrote. “It erodes public confidence in an institution that is essential to preserving the rule of law.”