The defense team on September 24 accused the court of making "intolerable mistakes."
Shortly after the session opened, Hussein was ejected from the courtroom after complaining about being kept inside a metal pen.
The judge, Muhammad al-Uraybi, also ejected Hussein at the last hearing on September 20 for interjecting.
Hussein and his former colleagues face charges including genocide for spearheading a military campaign against the Kurds in the 1980s that prosecutors say left 182,000 dead.
In testimony presented on September 25, a Kurdish villager told the court that women prisoners were often raped by a prison warden during the campaign.