Obama calls for UK to stay in the EU
US President Barack Obama urged the UK not to leave the EU as membership would allow it to still have influence on the world stage.
Obama was speaking in an interview with the BBC when he called for the country to reconsider the EU membership.
He said the UK's EU membership "gives us much greater confidence about the strength of the transatlantic union".
But British Eurosceptic politicians criticised his intervention, saying it was up to Britain to decide.
David Cameron has said a referendum on whether or not to remain a member of the EU will be held by the end of 2017.
That referendum will follow a renegotiation of the existing terms of British membership.
The prime minister has said he will campaign for Britain to remain in the EU if he gets the reforms he wants.
Speaking to the BBC's North America editor Jon Sopel, he said the EU "made the world safer and more prosperous".
Obama said the UK was America's "best partner" because of its willingness to project power beyond its "immediate self-interests to make this a more orderly, safer world".