Former Ukrainian Prosecutor General Viktor Shokin said that his office prepared in the summer of 2016 to interview then-Vice President Joe Biden’s son Hunter Biden as part of a money laundering probe into Hunter Biden’s employer, the Burisma energy company.

That’s when the pressure to stop investigating Hunter Biden’s possible role in the alleged crimes increased, Shokin told One America News.

“Poroshenko came to me and said, ‘You are a patriot of Ukraine. We need this billion dollars. We are at war and if you are a patriot, you will close this case,” Shokin said. The phone call came after prosecutors seized some of Burisma’s assets as part of the investigation.

“Poroshenko called me and said, ‘Listen this all has to stop already. Joe Biden’s temper is overflowing,” Shokin said.

The seizure of the assets prompted an in-person visit by Poroshenko, who asked Shokin to resign.

Poroshenko said that Biden was “angry about you freezing Burisma assets.”