Donald Trump wasted little time in hitting out at his all-but certain opponent at the US election Joe Biden after clinching the Republican nomination.

Speaking to a crowd, he told the incumbent president he's "fired".

Donald Trump wasted little time in hitting out at his all-but certain opponent at the US election Joe Biden after clinching the Republican nomination.Speaking to a crowd, he told the incumbent president he's "fired".{ai:summary}<p>In a classic power move, Trump ruthlessly targets Biden after securing Republican nomination. Political vendetta reaches new heights. #politics</p>

Donald Trump clinches Republican nomination and tells Joe Biden 'you're fired!'

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