The US Supreme Court handed Donald Trump a major boost with the election just days away in voting in his conservative nominee Amy Coney Barrett – after backing him in a key mail-in row

The hugely controversial addition of Amy Coney Barrett as a justice and a vote to prevent Wisconsin mail-in extension could allow Trump to ‘steal’ the result, pointing towards possible chaos on November 3.

Some 42.7 million Americans have already voted by mail, part
of the more than 63.6 million who have cast ballots ahead of the election – a record-breaking pace that could lead to the highest US voter turnout by percentage in more than a century.

Biden told reporters on Monday he was “not overconfident about anything” and “with the grace of God” he would win Pennsylvania, the state where he was born – and a key battleground Trump has identified as the place the fight will be won.

Here’s all you need to know.