If Microsoft will not delay the release of Windows XP, the New York senator said he wants some of the states involved in the anti-trust case to seek a court injunction to block its release.
But while Mr Grieve - the government's chief legal adviser - would not be drawn on the controversial move to block release of the NHS transition risk register, he doubted whether the case was part of moves to change freedom of information policy.
They are to continue talks on a new debt target for Greece, which has been a stumbling block for the release of the next 44 billion euros for the debt-strapped nation.