Former US Vice President Joe Biden has formally announced that he will seek the Democratic Party's nomination for the 2020 US presidential election.
"We are in a battle for the soul of this nation," Biden said in a stark video released online, calling on voters to deny Republican Donald Trump a second term in office.
Biden served as vice president from 2009 to 2017 under former President Barack Obama. Prior to that, Biden represented the state of Delaware in the US Senate between 1973 and 2009. He ran for president of the United States in 1988 and 2008, but withdrew early from both races.