WASHINGTON, July 30 (Reuters) - A secretive U.S. court ​created 30 years ago to deport suspected terrorists convened for the first time on Thursday, opening ‌a new front in the Trump administration's effort to remove non-citizens accused of national security threats and expand the president's immigration agenda.

The hearing, before the Alien Terrorist Removal Court, was open to the public and centered on Nazira Haji Zada, a 47-year-old lawful ​permanent resident accused of supporting Islamic State and helping conceal a failed Election Day 2024 mass shooting ​plot. Prosecutors say much of the evidence against the Texas woman cannot be publicly disclosed.

Established ⁠by Congress in 1996, the court allows the government to rely on classified evidence in deportation cases, a ​process Haji Zada's lawyer argued violates due process protections.

Haji Zada, who was in the Washington federal courtroom, has not ​been charged with any crimes, court documents show, but her son and son-in-law pleaded guilty to related charges last year.

“This entire scheme is in violation of due process and unconstitutional,” Matthew Farley, the defendant's attorney, said during the hearing. "This is a runaround to ​bringing a criminal case."

Farley quickly asked the court's chief judge, Joan Ericksen, to dismiss the case and immediately release ​his client. Ericksen, a federal district judge appointed to oversee the court, denied the request.

Created to handle deportation cases involving classified ‌national ⁠security information, the court went unused until Justice Department officials sought Haji Zada's removal this month. The FBI arrested her at her Fort Worth home on Tuesday.

“The allegations in this case show the matriarch of an ISIS-sympathizing family aiding in a plot to launch a mass casualty attack on American voters on Election Day,” acting Attorney General Todd ​Blanche said in a ​statement before the hearing.

Prosecutors have ⁠deemed much of the evidence classified and not safe for public release.

In a short unclassified summary of the case, the Justice Department alleged that Haji Zada had indoctrinated ​her children "with ISIS ideology" and had concealed the radicalization of her family and a ​planned move ⁠to ISIS territory from her husband.

"The underlying information is classified because disclosure would enable terrorists and terrorist organizations to avoid preventative or detection measures or would reveal FBI or other U.S. Intelligence Community sources," the FBI wrote in a July ⁠15 memo.

The ​court's lack of prior cases was evident as the judge, prosecutors ​and defense lawyers spent part of the proceeding resolving basic procedural questions, including how documents would be handled and who could access classified evidence.

It ​was unclear when the next hearing would take place.