President Donald Trump urged the Ukrainian president to get in touch with Attorney General William Barr about launching an investigation tied to Democratic presidential candidate Joe Biden, according to a transcript of the call released Wednesday.

“I would like you to do us a favor though because our country has been through a lot and Ukraine knows a lot about it,” Trump said during the call, before asking Ukrainian President Volodymyr Zelensky to look into a topic related to former special counsel Robert Mueller III’s investigation.