US warns Britain against leaving European Union

The Obama administration issued a direct challenge to David Cameron over
Europe, on Wednesday when it warned of the dangers of holding a referendum on
Britain's membership of the EU.A senior US official questioned the merits of
holding a referendum as the prime minister's campaign to reset the terms [...]
Source:
http://www.ezonearticle.com/2013/01/09/us-warns-britain-against-leaving-european-union/