The Prime Minister is put on the spot by someone from the German embassy.
David Cameron says "we should be more positive" about the success of the single market.
He says he makes no apology for standing up for UK interests in Europe; it is "simply not credible" to make cuts at home and increase the EU budget.
That "does not make you a bad European", he insists. He calls for more focus on how the European Commission spends its money.
More top news
Following a bruising televised debate with Hillary Clinton, Donald Trump's week seems to have only got worse.
Monarch's package holiday licence has been temporarily extended with the airline receiving "significant further investment".
Ex-football manager Harry Redknapp told undercover reporters his own players bet on the result of one of their own matches, it is claimed.