US President Barack Obama urged young people not to "pull back" from the world and to reject cynicism and xenophobia during a Q&A in London.
Obama's comments came after he faced criticism from leading Brexit campaigners, who branded him an irrelevant "lame duck", over a speech he made supporting the UK's membership of the EU.
President Barack Obama has left the UK after a flying visit in which he warned Britons not to vote to leave the EU.
The US leader waved to waiting crowds as he climbed aboard his person US Air Force One jet today.
He is now headed to Germany where he will hold talks with chancellor Angela Merkel, one of his closest allies in Europe.
Barack Obama has warned that Britain's influence on the global stage would be diminished if it votes to leave the EU.
The presidential hopeful says she agrees with Obama comments adding that she 'has always valued a strong UK in a strong EU'.
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