Who will replace Joe Biden? The leading alternative Democratic candidates | US News [Video]

Intense pressure is building on Joe Biden to quit after a series of gaffes called into question his mental and cognitive abilities.

The US president could be backed into a corner and forced to give up his position as the leading Democratic Party nominee before the November US election, such is the scrutiny he’s facing.

A poll carried out among 15,000 voters in vital swing states found other candidates had an average three-point lead on Biden, suggesting the 81-year-old could be on the brink.

Biden faced criticism after a ‘make or break’ press conference at a NATO summit saw him refer to Volodymyr Zelensky as ‘President Putin’ and Kamala Harris as ‘Vice President Trump’.

It comes after a rambling, incoherent performance during last month’s debate against Donald Trump raised serious doubts about his ability to contest the election.

Fears have continued to grow within his party that Trump could make a return to the White House if Biden …