Kurt Volker Kurt VolkerGOP senators request details on Hunter Biden's travel for probe Yovanovitch retires from State Department: reports Live coverage: Senators enter second day of questions in impeachment trial MORE, the State Department special envoy to Ukraine who resigned last week amid Democrats' impeachment inquiry into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE, reportedly met last year with officials from Burisma, the Ukrainian company denounced by the Trump administration as corrupt.

The Associated Press reported Wednesday that Volker met with officials from Burisma at a conference in September 2018 hosted by the Atlantic Council. A photo of Volker and an adviser to Burisma later appeared on the company's website.

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According to multiple attendees, Volker met briefly with Vadym Pozharskyi at the conference, though it was not known if their discussions included Trump's efforts to spur an investigation into former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son Hunter Biden, who previously served on Burisma's board.

The administration has in recent days accused the company of corrupt business dealings through its connection to Hunter Biden, who Trump says benefited from efforts by his father to dismiss a Ukrainian prosecutor who at one point in time investigated Burisma.

No wrongdoing by either Biden has been suggested by Ukrainian officials, and the prosecutor who Trump argued was targeted said recently that Hunter Biden was not found to have committed a crime.

“From the perspective of Ukrainian legislation, he did not violate anything,” said Yuri Lutsenko, Ukraine's former top prosecutor. “Hunter Biden cannot be responsible for violations of the management of Burisma that took place two years before his arrival.”

Trump's efforts to persuade Ukraine's president to launch an investigation into Joe Biden, currently the top-polling candidate in the 2020 Democratic primary, has become the center of House Democrats' impeachment investigation.

Volker is set to appear before House lawmakers on Thursday to give a deposition as part of that inquiry.