Mr. Biden’s pressure on President Petro Poroshenko to remove his poor-performing prosecutor general, including by threatening to withhold additional aid, was fully consistent with American interests. It was also a policy fully supported by the International Monetary Fund and our European partners, who along with the United States were providing billions in economic assistance to support the newly elected Ukrainian government.

This broadly backed anti-corruption policy had nothing to do with Mr. Biden, his son Hunter, or any other individual. Moreover, the policy was conducted transparently and openly for all to see. As has been widely reported, the prosecutor general also was not pursuing any inquiry of Hunter Biden or the owner of the company whose board he sat on, Burisma, at the time of the vice president’s intervention. Indeed, by pressing for the removal of the corrupt prosecutor general, Mr. Biden backed a policy that increased the likelihood that a responsible replacement might pursue Burisma’s owner and others.

By contrast, President Trump conducted absolutely no government business when he spoke for thirty minutes with Ukraine’s new president, Volodymyr Zelensky. Instead, Mr. Trump solicited foreign interference in the 2020 election to advance his own political interests.