BAGHDAD -- Ramsey Clark, the former U.S. Attorney General and antiwar activist, arrived here yesterday and was expected to try to show up at the reopening of Saddam Hussein's trial in Baghdad today, but a U.S. government official warned that he was not officially registered with the court. "As of today, [chief defense lawyer] Khalil Dulaimi has never filed with the Iraqi tribunal the proper paperwork to have an international lawyer work with the defense team," the official said on the condition of anonymity. "He has been invited to do so and told how to do so on a number of occasions. If a proper motion is filed for a qualified international attorney as an adviser to the defense team, it is expected that the court will accept that request," said the U.S. official, who is close to the tribunal. Mr. Clark, who has defended former Yugoslav President Slobodan Milosevic, has advised the defense team and questioned the impartiality of the court, set up while Iraq was under U.S. control. "Our plan is to go to court in Baghdad on Monday morning representing the defense counsel as defense support. A fair trial in this case is absolutely imperative for historical truth to justice obviously," Mr. Clark told Reuters news agency in Amman. Some Shi'ites are worried that Mr. Clark's presence -- especially if contested -- will turn the trial into a circus, with Saddam taking over the proceedings much as he did when the trial began Oct. 19.