US President Joe Biden and his predecessor Donald Trump were all but guaranteed to face off on November 5 in a rematch of the 2020 presidential election, after both achieved the required number of delegates to be nominated as candidates of the Democratic and Republican parties respectively. Biden on Tuesday passed the required 1,968-delegate threshold to be nominated as the Democratic presidential candidate, according to a count by US broadcasters CNN and NBC following his victory in the Georgia primary. As Biden had no serious competition in his party, it was already considered certain that t…