A 21-year-old man charged with plotting to plant a bomb at an Army post in Kansas to help the Islamic State group is asking a federal judge to delay his next court hearing.

An attorney for John T. Booker Jr. of Topeka filed the request Tuesday. Booker was scheduled to appear Aug. 19 before U.S. District Judge Carlos Murguia in Kansas City, Kansas, to have the status of his case reviewed.

Booker’s attorney wants the hearing postponed until Sept. 19 because of unspecified scheduling conflicts. The request also says Booker needs more time to confer with his attorneys.

According to court documents, Booker was arrested in April while trying to arm what he thought was a 1,000-pound bomb inside a van near Fort Riley, about an hour west of Topeka.