Trump knows “I’ll beat him like a drum”: Biden

Former Vice President Joe Biden told a reporter on Saturday (September 21) that President Donald Trump 'deserves to be investigated."

On Friday reports by U.S. media outlets said Trump repeatedly pressured Ukraine's president to investigate Joe Biden, one of Trump's chief political rivals, in a July phone call.

The call featured in a classified whistleblower complaint that has sparked a political battle between Democrats warning of a national security threat and Republicans turning it into an attack on Biden, a frontrunner in the field of Democrats seeking to challenge Trump in the 2020 presidential election.

Reuters has not confirmed details of the whistleblower's complaint.

"Trump's doing this because he knows I'll beat him like a drum," Biden told reporters in Des Moines, Iowa on Saturday.

Biden said Trump is "using every element of the presidency to try to do something to smear me."