Biden to join Harris on campaign trail for first time since dropping out of race

Pair due to appear together in Pittsburgh in vital swing state of Pennsylvania, aimed at cementing support from unions

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 Labour 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".