gambling
The prime minister repeatedly refused to say whether he had told the election date to one of the candidates being investigated.
Philip Davies told The Sun he did the same in 2005 but the wager "went down the pan".
Alister Jack admitted placing three wagers but has insisted he had no insider knowledge of when the PM would go to the country.
Scottish Secretary Alister Jack insisted he had no inside knowledge before laying the wager.
Craig Williams said he was guilty of "an error of judgment, not an offence".
The PM has been criticised for failing to suspend those accused of putting money on the date of the election.
The controversy is intensifying with the election just 10 days away.
Voters already think the PM is weak and the controversy has only reinforced that opinion.
The Conservatives' head of data is the latest senior official to be dragged into the scandal.
The prime minister repeatedly dodged questions on how deep the scandal goes.