Ukraine’s former top law enforcement official says he repeatedly rebuffed demands by President Trump’s personal lawyer to investigate Joe Biden and his son, insisting he had seen no evidence of wrongdoing that he could pursue.

In an interview, Yuri Lutsenko said while he was Ukraine’s prosecutor general he told Rudolph W. Giuliani that he would be happy to cooperate if the FBI or other U.S. authorities began their own investigation of the former vice president and his son Hunter but insisted they had not broken any Ukrainian laws to his knowledge.

