On the sidelines of the EU summit in Brussels, U.K. Prime Minister David Cameron said the choice of Jean-Claude Juncker to head the European Commission marks "a bad day for Europe." John Thys/AFP/Getty Images hide caption

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President Obama and British Prime Minister David Cameron in the Oval Office of the White House on Monday. Jim Watson /AFP/Getty Images hide caption

itoggle caption Jim Watson /AFP/Getty Images

This file picture taken on October 18, 2010, shows British Defense Secretary, Liam Fox, leaving after attending a cabinet meeting at 10 Downing Street.

Carl Court/AFP/Getty Images hide caption

itoggle caption Carl Court/AFP/Getty Images