President Donald Trump insisted he doesn't know Lev Parnas, a Rudy Giuliani associate who says he helped the president's personal lawyer dig up dirt on Joe Biden in Ukraine, despite multiple pictures of Parnas with Trump and his family.

"I don't know Parnas other than I guess they had pictures taken which I do with thousands of people," Trump told reporters in the Oval Office on Thursday. "I don't know him at all, don't know what he's about, don't know where he comes from, know nothing about him."

Trump also said he was unfamiliar with a letter Giuliani, his personal lawyer, wrote to Ukraine's president, Volodymyr Zelenskiy, asking for a meeting in the U.S. president's name shortly after Zelenskiy's election last year.