As Joe Biden wins the Democratic presidential nomination, a new poll shows that he's also retaken the lead over President Trump with registered US voters.

Biden now leads Trump 45 per cent to 42 per cent in Election 2020 polling, pulling ahead after being tied at 43 per cent in May, according to the newly released June IBD/TIPP Poll.

The former vice president passed the 1,991 delegate threshold on Friday to secure his party's nomination as counting continued from Tuesday's round of Democratic primaries.

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