Hussein was in court yesterday for the first time after skipping the last two sessions, protesting over the court's legitimacy.
Two former Hussein aides refused on 13 February to testify against him.
Former head of the presidential office Ahmed Khudayir and ex-intelligence chief Hassan al-Obeidi both said they had been brought to court against their will.
During another stormy session, Hussein said he too was forced to attend and shouted "Down with [U.S. President George W.] Bush."
Hussein and seven codefendants face charges over the 1982 killing of 148 people in the village of Al-Dujayl.
(compiled from agency reports)