Donald Trump mocked a protestor while speaking at a rally in ‘battleground’ Pennsylvania on Saturday night.

The president trails Democratic presidential nominee Joe Biden in the Keystone State by 4.3 per cent, according to an average of polls tabulated by RealClearPolitics. But Mr Trump and his campaign aides say their polling, like in 2016, shows a far closer race there.

The incident comes after a progressive activist group of Democrat supporters announced they had purchased the internet domain name in an attempt to fight Ms Barrett’s nomination to the Supreme Court – a move which they say confirms Mr Trump’s efforts to take over the US judicial system.