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Nine News: Robert Shortt, Washington Correspondent, reports as Lewis Libby makes his first appearance in a Washington court
The former White House aide, Lewis Libby, has pleaded not guilty at a court in Washington to charges related to a leak which revealed the identity of a CIA agent.
Mr Libby, who was chief of staff to the US Vice President Dick Cheney, faces five counts of perjury, making false statements and obstructing justice.
The charges arise from an inquiry into the leak of Valerie Plame's identity.
Her husband - a former ambassador - had criticised the case for invading Iraq.
