Downing Street has insisted the Leveson Inquiry was handed all communications between David Cameron and Rebekah Brooks that were requested, amid claims that there is a further tranche of unpublished emails and texts between the pair.
The Prime Minister was accused by a Labour MP of being "less than straightforward" after The Independent reported there were dozens of emails which had not been given to Lord Justice Leveson's inquiry into the media.
There are also said to be unreleased emails between Mr Cameron and Andy Coulson from when the latter was still working for News International.
Mrs Brooks resigned as chief executive of News International over the phone-hacking scandal last year.
Downing Street sources stressed that the Leveson Inquiry had only requested the release of communications between Mr Cameron and Mrs Brooks that were "relevant".
A No 10 spokesman said: "All the material the inquiry asked for was given to them."
But Labour MP Chris Bryant said: "If the Prime Minister has taken any steps to prevent any material, relevant or not - whether texts, emails or notes of conversations, between David Cameron and Rebekah Brooks, Andy Coulson and News International - from coming into the public domain, then people will think this is yet another instance of the Prime Minister being less than straightforward with the country."