Cameron defends Britain's desire for sovereignty before EU summit

By Michael Hogan HAMBURG, Germany (Reuters) - Prime Minister David Cameron defended Britain's desire to protect its sovereignty on Friday, appealing for understanding from the European Union in his talks for better membership terms that could be decided next week. At a dinner in German city of Hamburg with Chancellor Angela Merkel and civic and business leaders, Cameron said he knew some may see Britain as "argumentative and rather strong-minded" by trying to renegotiate its terms with the 28-me