Joe Biden has cemented his position as front-runner in the Democratic race to take on President Donald Trump in November's White House election.

The former vice-president is projected to win Michigan - the biggest prize of primary voting on Tuesday - and extend his lead over Bernie Sanders.

Mr Biden's chances recovered with big wins on Super Tuesday, after which several former rivals endorsed him.

It is unclear if Mr Sanders will fight on until the party convention in July.

The Democrats' next big election milestone is in a week's time when 577 delegates are up for grabs.

To secure the nomination, a candidate needs the support of 1,991 delegates. Before Tuesday's vote, Mr Biden had 648 to Mr Sanders' 563.

BBC