Donald Trump taunts Hillary Clinton, says she should enter 2020 presidential race

Democratic White House hopeful Joe Biden called Wednesday for President Donald Trump's impeachment, saying he'd "betrayed" the United States.

Trump, however, showed no sign of buckling under pressure from the impeachment probe into his alleged bid to damage Biden by pressuring Ukraine to investigate the former vice president for corruption.

"To preserve our constitution, our democracy, our basic integrity, he should be impeached," Biden told supporters at a rally in New Hampshire, adding his voice to that of other Democratic contenders who want to see Trump impeached.