WASHINGTON (REUTERS) - The White House is preparing to release a whistle-blower complaint about United States President Donald Trump's call with Ukraine's leader by the end of the week, Politico reported on Tuesday (Sept 24), citing a senior administration official.

Media reports have said Mr Trump pressured Ukrainian President Volodymyr Zelensky in a phone call to investigate Democratic presidential front runner Joe Biden and his son, spurring the US House of Representatives to launch an impeachment inquiry into the President.

Mr Trump said on Tuesday that he would release a transcript of the call between the two leaders, but the White House had previously resisted releasing the complaint.