US Senator Elizabeth Warren, who formally dropped out of the race for the White House in March, has endorsed former Vice President Joe Biden for US president in a Twitter post.
Warren has published a video declaring her support for the remaining candidate in the Democratic presidential nomination race.
The report comes after Senator Bernie Sanders and former President Barack Obama endorsed Biden earlier this week.
On 2 April, the Democratic National Committee (DNC) announced that US Democrats due to the coronavirus pandemic will postpone their presidential convention by more than a month to 17 August. The Republicans scheduled their convention 24-27 August in the US city of Charlotte, North Carolina, where they are expected to formally nominate President Donald Trump for a second term in office. Trump faces no serious opposition within his party.
Biden remains the clear frontrunner with more pledged delegates won in states that held primary elections before the pandemic hit.