Donald Trump attacks Kamala Harris as 'big failure'

President Donald Trump took aim at Democratic vice presidential candidate Kamala Harris day after Joe Biden anunced her as his running mate.

Speaking at a White House press briefing Wednesday, Trump criticized Biden's pick as "risky," citing tensions between two candidates during primary election season.

"I think she's going to be a big failure and I think I look forward to debate between her and Mike Pence," he said.

Harris is making history as first Black woman on a national major party ticket, and she'd be first woman to hold national executive office if Biden wins.

Democrats see Harris as appealing to progressives, mainstream liberals and some independents and Republicans unhappy with Trump.

president and his allies are attempting to cast her as too left-wing for country.