"We want to ensure that there will be immediate, secure and full access to all of the prisoners of the former government including the former President Saddam Hussein by the counsel of their choice," he said at a news conference in Washington.
Clark, who was President Johnson's attorney general, will serve on a committee to defend the rights of the former Iraqi president.
"It is of the utmost importance to historic truth, public justice and peace that the United States respect the dignity and rights of President Saddam Hussein and all officials of the former government of Iraq with absolute fidelity," he said.
The committee -- made up of former top international officials from the United States, France, Malaysia and Algeria -- has written a letter outlining its demands to President Bush.
"You cannot have a fair trial without the fair procedures," Clark said.