"The polls already suggest that Trump is likely to win back the presidency in November, after a torrid few months for his opponent and a criminal conviction that has had little impact on his popularity.

If history tells us anything, the events of Saturday will only increase his support. In the months after Mr Reagan was shot, the newly-elected Republican president saw a poll boost of eight points.

On Monday, Trump will greet supporters in Milwaukee, Wisconsin, to announce his running mate at the Republican Party's national convention."