Joe Biden calls for Trump's impeachment

Former Vice President and Democratic presidential front-runner for the first time called for President Donald Trump's impeachment, saying the White House occupant is a "threat to American democracy" and has "violated" his oath of office.

His party has launched an impeachment inquiry over claims that Trump pressured Ukraine's President Volodymyr Zelensky in a July 25 phone call to look into what the U.S leader said were corrupt business deals involving Biden.

Democrats say that Trump tried to coerce Zelensky by holding back U.S military aid to Ukraine.

Trump has denied wrongdoing and has dismissed the probe as a "witch hunt".

Speaking at an election rally in New Hampshire, Biden said: "No President in American history ever dared engage in such unimaginable behaviour. With his words and with his actions, President Trump has indicted himself. By obstructing justice and refusing to comply with the congressional inquiry, he has already convicted himself."

In full view of the American people, Trump has violated his oath of office, betrayed this nation, and committed impeachable acts.

To preserve our Constitution, our democracy, and our basic integrity, he should be impeached, said Biden as for the first time he publicly supported Democratic leaders in the House of Representatives to impeach Trump.