After U.S. Energy Secretary Rick Perry proposed political backer Michael Bleyzer as an adviser to Ukraine’s president, the Houston man and his partner “secured a potentially lucrative” energy deal from the Ukrainian government, the Associated Press reported Monday.

Perry, the former Texas governor, attended Ukrainian President Volodymyr Zelensky’s inauguration this year and gave him a list of people who could serve as energy advisers, which included Bleyzer, according to the AP. More than a month later, Ukraine awarded an oil and gas exploration contract to Bleyzer and his partner Alex Cranberg, the news agency reported.

Democrats on three U.S. House committees last month subpoenaed documents from Perry as part of their impeachment inquiry into allegations that President Donald Trump asked Zelensky to investigate Democratic U.S. presidential candidate Joe Biden’s son.

An Energy Department official said Perry did not plan to comply with the subpoena, The Washington Post reported. Perry last month also told Trump he will resign from his cabinet position by the end of this year.

Belyzer told the AP that the deal with the Ukrainian government was competitive and transparent. He denied that Perry helped his firm secure the contract.

“I believe that Secretary Perry’s conversations with Ukrainian government officials, if they in fact took place, did not play any role in Ukrainian Energy winning its bid,” Bleyzer said in a statement to the AP.

An Energy Department spokeswoman told the news agency that Perry has lobbied for American industry across the globe, but did not “advocate for the business interests of any one individual or company.”

An attorney for Aspect Holdings, Cranberg’s company, told the AP that American officials supported “a fair, competitive process.”

“Aspect neither sought, nor to our knowledge received, special intervention on its behalf,” Aspect lawyer Amy Flakne told the news agency.