The prosecutor said he is reviewing all the cases that were closed by his predecessors – including several related to the owner of gas company Burisma Holdings where former Vice President Joe Biden´s son sat on the board of directors and was reportedly compensated $50,000 a month.

The developments in Ukraine come after newly-revealed Ukraine texts show Trump administration officials discussing efforts to get a probe and push a set of talking points – including by leveraging a presidential visit.

President Trump, speaking on the South Lawn of the White House Thursday, said Ukraine should investigate the Bidens, while also saying China should probe Hunter Biden's business dealings there.

The president  suggested on that China showered $1.5 billion on Hunter Biden in order to influence his father and win favorable trade deals with the United States.