Ukraine’s prosecutor general said in an interview that he had no evidence of wrongdoing by U.S. Democratic presidential candidate Joe Biden or his son, despite a swirl of allegations by President Donald Trump’s lawyer.

The controversy stems from diplomatic actions by Biden while his son, Hunter Biden, sat on the board of Burisma Group, one of the country’s biggest private gas companies. As vice president, Biden pursued an anti-corruption policy in Ukraine in 2016 that included a call for the resignation of the country’s top prosecutor who had previously investigated Burisma.

Yuriy Lutsenko, the current prosecutor general, said that neither Hunter Biden nor Burisma were now the focus of an investigation. He added, however, that he was planning to offer details to U.S. Attorney General William Barr about Burisma board payments so American authorities could check whether Hunter Biden paid U.S. taxes on the income.