Joe Biden will join Kamala Harris on the campaign trail for the first time on Monday since standing aside six weeks ago to let the vice-president claim the presidential nomination following a poor debate performance.
The pair were due to appear together in Pittsburgh in the vital swing state of Pennsylvania at a Labor Day event aimed at cementing support from trade unions, a key Democrat constituency and a bedrock of Biden’s support as he has styled himself as “the most pro-union president in US history”.