Biden expected to announce 2024 presidential campaign on Tuesday

Launch would come exactly four years after president announced his 2020 bid, where he warned soul' of the nation is at stake

Joe Biden is expected to announce his 2024 re-election campaign as early as Tuesday, possibly setting the stage for an extraordinary rematch with Donald Trump.

A Tuesday launch would come exactly four years after Biden announced his 2020 presidential bid, in which he warned that the soul" of the nation was at stake after four tumultuous years under Trump.