They point to Republican congressional inquiries that they say hint at wrongdoing by the Bidens even without confirmation. They point to the continuing federal criminal investigation of the president’s son Hunter, suggesting it has been impeded. And they point to the fact that the president himself is also under investigation over retaining classified documents yet not charged.
The differences between the cases, however, are stark, making apples-to-apples comparisons complicated. In the documents investigation, for instance, Mr. Biden’s advisers by all accounts so far returned the papers to the authorities promptly after discovering them. Mr. Pence did the same after a voluntary search found that the former vice president had kept classified documents, and he was recently cleared by the Justice Department because there was no evidence of willful violations of the law.
Mr. Trump, by contrast, refused to hand over all the documents he had taken from the White House — even after being subpoenaed for them. According to the indictment, he orchestrated an expansive scheme to hide papers and feed lies to authorities seeking them. On two occasions, the indictment charged, Mr. Trump showed secret documents to people without security clearance and indicated that he knew he was not supposed to.
As for seeking to weaponize the Justice Department, there was ample evidence that Mr. Trump sought to do just that while in office. He openly and aggressively pushed his attorneys general to prosecute his perceived enemies and drop cases against his friends and allies, making no pretense that he was seeking equal and independent justice. His friends-and-family approach to his pardon power extended clemency to associates and those who had access to him through them.
He chipped away at so many norms during his four years in office that it is no wonder that institutions have faced credibility problems. Indeed, he has made clear that he does not respect the boundaries that constrained other presidents. Since leaving office, he has called for “termination” of the Constitution so that he could be returned to power without waiting for another election and vowed that he would devote a second term to “retribution” against his foes while pardoning supporters who stormed the Capitol on Jan. 6, 2021, to stop the transfer of power.
There is no known evidence, on the other hand, that Mr. Biden has played any role in the investigations against Mr. Trump. Unlike the voluble Mr. Trump, he has made a point of not even publicly commenting on individual prosecutions, saying he respects the autonomy of the Justice Department.
Attorney General Merrick B. Garland has been sensitive to the matter of perception and sought to insulate the inquiries by appointing Mr. Smith, a career prosecutor who is not registered with either political party, as a special counsel with a guarantee of independence absent manifest wrongdoing on his part.
