President Donald Trump took aim at Democratic vice presidential candidate Kamala Harris the day after Joe Biden announced her as his running mate. Speaking at a White House press briefing Wednesday, Trump criticized Biden's pick as "risky," citing tensions between the two candidates during the primary election season. "I think she's going to be a big failure and I think I look forward to the debate between her and Mike Pence," he said. Harris is making history as the first Black woman on a national major party ticket, and she'd be the first woman to hold national executive office if Biden wins.