Long-anticipated announcement positions Biden for a rematch against current Republican frontrunner Donald Trump.

United States President Joe Biden has officially launched his campaign for re-election in 2024, becoming the Democratic frontrunner in a race that could pit him for a second time against Republican contender Donald Trump, according to his campaign video.

Biden’s announcement on Tuesday came on the fourth anniversary of his first successful presidential bid, launched on April 25, 2019.

A majority of Democrats have said they would back Biden, 80, against a Republican challenger in next year’s election, a recent poll found.

But the Democratic president faces some of the lowest approval ratings of his tenure so far, and his age — Biden is currently the oldest person to hold the US’s highest office — has spurred questions about his re-election prospects.

This is a breaking story. More to follow.