Former US Vice President Joe Biden has extended his lead in the race to become the Democratic nominee for the upcoming presidential election.
He beat rival Bernie Sanders in Florida, Illinois and Arizona; however, a vote in Ohio was suspended due to the COVID-19 outbreak.
The outbreak dominated the lead-up to the votes. The virus has now been confirmed in all 50 states, with over 6,400 cases and more than 110 deaths throughout the country.
It meant neither candidate was able to address live election rallies ahead of the votes, with Mr Biden streaming a message to YouTube instead.
He promised to unite to Democratic Party before uniting the country if he wins the right to challenge Donald Trump for the White House.
He said Senator Sanders and his supporters had brought “passion and tenacity” to the primary campaign.
“Together they have shifted the fundamental conversation in this country,” he said.
“So, let me say especially to the young voters who have been inspired by Sen. Sanders: I hear you, I know what is at stake; I know what we have to do.”
Mr Biden currently has 1,147 pledges compared to Senator Sanders’ 861.
At total of 1,991 is needed to win the nomination.
