Joe Biden has clinched the Democratic nomination for president after winning the Georgia primary.

The president's win in the Peach State means he has reached the 1,968 delegates necessary to take the nomination. He will be officially recognised at the Democratic National Convention in Chicago this August.

Meanwhile, Donald Trump also secured another victory in Georgia on Tuesday bringing him closer to the Republican nomination and a rematch of the 2020 election with Mr Biden.

Mr Trump's only significant competition came from former UN ambassador Nikki Haley, who dropped out of the race for the GOP nomination earlier this month, following major defeats on Super Tuesday.

Both men later won the Missippi primaries, though Mr Trump was still left just short of clinching the Republican nomination.

Biden, who mounted his first bid for president 37 years ago, did not face any serious Democratic challengers to his run for reelection at age 81. That was despite facing low approval ratings and a lack of voter enthusiasm for his presidency - driven in part by his age.

Just 38 per cent of US adults approve of how Mr Biden is handling his job as president while 61 per cent disapprove, according to a recent survey by The Associated Press-NORC Center for Public Affairs Research.

Already the oldest-ever American president, Mr Biden would be 86 if he served out the entirety of a second term. Regardless of the November outcome, he or Mr Trump would be the oldest leader ever sworn in on Inauguration Day 2025.

63 per cent say they're not very or not at all confident in Mr Biden's mental capability to serve effectively as president, while 57 per cent said the same of Mr Trump.