http://www.guardian.co.uk/usa/story/0,12271,1053191,00.htmlPresident Bush's closest political adviser, Karl Rove, was yesterday at the centre of a criminal investigation into allegations that he leaked the name of a CIA agent in an attempt to suppress criticism of the administration's Iraq policy, in what is fast becoming the administration's worst scandal since coming to office.
The White House fended off calls for an independent inquiry but urged its staff yesterday to cooperate with a justice department investigation.
Over the next few days, FBI agents will question Washington journalists and administration officials about claims that Mr Rove and others in the White House deliberately blew the cover of Valerie Plame, a CIA expert on weapons of mass destruction.
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Mr Novak and the other journalists involved have refused to name their sources. Their lawyers are expected to claim protection from the law under the first amendment of the constitution guaranteeing freedom of speech.
But a 1972 supreme court ruling, Branzburg v Hayes, states "the first amendment does not relieve a newspaper reporter of the obligation that all citizens have to respond to a grand jury subpoena and answer questions relevant to a criminal investigation".