The attorney general, Dominic Grieve, is facing growing pressure to block an attempt by the Metropolitan police to use the Official Secrets Act to force journalists to reveal their sources.
As senior Liberal Democrats indicated that Nick Clegg was "sympathetic" to journalists, police sources also expressed unease after Scotland Yard applied last week for an order under the 1989 act to require the Guardian to identify its sources on phone hacking. One police source said the decision to invoke the act was "likely to end in tears" for the Met.
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