JD Vance is the star speaker tonight at the third and final night of the 15-18 July Republican National Convention. His appearance follows the announcement that he will be Donald Trump's running mate and vice-presidential nominee for the US presidential election in November.

Donald Trump may be presenting himself to American voters as a unifier, after surviving the attempt on his life, but the pundits have not seen his appointment of JD Vance as running mate as a move designed to win over the middle ground.

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