Defiance, slip-ups and high stakes: Biden spars with media

US President Joe Biden mistakenly referred to Vice-President Kamala Harris as 'Trump' during a Nato press conference.

The gaffe came hours after he misnamed Ukrainian President Volodymyr Zelensky as “President Putin” while speaking to reporters about Nato’s support for Ukraine.

At the press conference, he also made a defiant case for staying in the presidential race and why he believes he is the best candidate to defeat Donald Trump.