The alleged mastermind of the Sept. 11 terrorist attacks and four other men had a contentious day in a military commission arraignment at Guantanamo Bay, Cuba, on Saturday. NPR's Dina Temple-Raston tells host Rachel Martin what happened.

The self-proclaimed mastermind of the Sept. 11 attacks, Khalid Sheikh Mohammed, and four other accused terrorists entered a military courtroom in Guantanamo Saturday with a plan: to disrupt their arraignment at every turn.

It wasn't a wild scene in the Guantanamo Bay courtroom where the self-proclaimed mastermind of the Sept. 11 attacks and four others were being arraigned on Saturday, but it was certainly in disarray.

It wasn't a wild scene in the Guantanamo Bay courtroom where the self-proclaimed mastermind of the Sept. 11 attacks and four others were being arraigned on Saturday, but it was certainly in disarray.

Khalid Sheikh Mohammed goes before a military commission in Guantanamo Bay, Cuba, on Saturday. But he has boasted the Sept. 11 attacks were just one of the many plots he organized.

In the main trial in the Sept. 11 attacks, Khalid Sheikh Mohammed and four other defendants are set to be arraigned Saturday before a military commission. The military commissions have been revised over the past several years, but there's still debate about their fairness.