FORT MEADE, Md. — A Saudi man accused of helping to plot Al Qaeda’s attack on the USS Cole in 2000 told a military commission judge at Guantanamo Bay, Cuba, on Wednesday that he would boycott his case if military guards force him to wear chains as a condition of coming to court.

The defendant, Abd al-Rahim al-Nashiri, stood at a desk to deliver a monologue several minutes long about what he portrayed as bad treatment and unnecessarily aggressive security measures by prison guards. An uncomfortable car used to transport him to the court made him vomit, he said, and belly chains hurt his bad back.