(CNN) Ukraine will review previous investigations into the owner of an energy company linked to the son of former US Vice President Joe Biden, the country's prosecutor general announced Friday.

Ruslan Riaboshapka said his office was reviewing a number of cases opened by previous prosecutors, including probes into the owner of Burisma Holdings, a Ukrainian natural gas company that Hunter Biden once sat on the board of.

US President Donald Trump pressured Ukrainian leader Volodymyr Zelensky to investigate both Bidens during a phone call on July 25, setting off an impeachment inquiry into whether Trump abused the power of his office in order to damage a political rival.

"We are reviewing all cases opened by the previous prosecutor's office," Riaboshapka said when asked specifically about Burisma on Friday. "We will conduct an audit of previous cases including the one you mentioned."

Read More