A wild three weeks in US presidential politics: a timeline

It's been tumultuous few weeks marked by concerns about Biden's acuity and an assassination attempt on Trump

They may go down as the wildest three weeks in the history of the US presidency, when the prospects of Joe Biden's candidacy surviving until polling day seemed to change from day to day - sometimes even from hour to hour.

Here is a summary of the milestone events as Biden's re-election effort went through a maelstrom of uncertainty.