The Metropolitan Police is seeking a court order under the act - intended to protect national security - that would compel a newspaper to hand over documents relating to the News International phone-hacking scandal.
The police force’s move prompted a growing political backlash, and was widely criticised at the Liberal Democrat conference in Birmingham yesterday.
Don Foster, the party’s spokesman on media issues, told a fringe meeting that Mr Grieve should use his “discretion” as the Government’s chief law officer to stop the Met using the Act against The Guardian.
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