Joe Biden is gaining ground in six critical swing states won by Donald Trump in 2016, according to new Democratic party polling, boosting the Democrats’ hopes of wresting back the White House.

Mr Biden’s overall support has jumped as much as 3 percentage points in Arizona, Florida, Michigan, North Carolina, Pennsylvania and Wisconsin, according to Priorities USA, the main Democratic super PAC backing the former vice-president. Super PACS are political action committees that can raise unlimited sums of money.

In Pennsylvania, Wisconsin and Michigan, Mr Biden was leading Mr Trump by 5 to 6 percentage points, up from 1 -2.5 points previously, the group said. In Arizona and North Carolina, Mr Biden was up 1-2 points after being 1-2 points behind. The two were close to even in Florida, the group said.