The Prime Minister was asked whether he will call on the Chancellor George Osborne to apologise for allegations he was seen to have made against the Shadow Chancellor Ed Balls over the Libor rate-rigging affair.
He replied that Mr Osborne had said that Mr Balls "had some questions to answer". He continued: "I'm not sure there's anyone in this house who doesn't thing the Shadow Chancellor has some questions to answer".
Bob Diamond tonight angrily rejected suggestions that he misled MPs over regulators' concerns about activities at Barclays.
The Bank of England's Paul Tucker told MPs he refuted claims that he attempted to influence Barclays into manipulating the Libor rate.
MPs will be hoping the Deputy Governor of the Bank of England will shed some light on unanswered questions about rate-fixing at Barclays.