PARKLAND, Fla. — A Tuesday morning hearing in the criminal case against the suspect accused in the Florida high school shooting has been canceled.

Prosecutors are seeking to obtain hair samples, fingerprints, DNA and photographs of Nikolas Cruz, 19. The hearing was removed from the court docket and no explanation was immediately available.

Cruz, who has been charged with 17 counts of murder, was not expected to appear in court because he waived his right to attend the hearing. He is being held without bail at the Broward County Jail.

In a separate court matter, Cruz’s lawyers are seeking to disqualify a judge from presiding over the case. The defense says in court papers that Circuit Court Judge Elizabeth Scherer is biased in favor of prosecutors, threatening Cruz’s right to a fair trial.

Cruz signed an affidavit in a barely legible printed scrawl that resembled the writing of a young child.

As the case moves through the courts, it has fueled a debate over gun control in the halls of the Florida Capitol in Tallahassee, hours from where the shooting took place at Marjory Stoneman Douglas High School in Parkland.