KANSAS CITY, Kan. (AP) — The top federal public defender in Kansas has asked a judge to reconvene a hearing on whether prosecutors improperly used secret recordings of conversations between inmates and their attorneys at a federal prison in Kansas.

Public Defender Melody Brannon says in a court filing Monday that the Department of Justice has reversed agreements reached in negotiations with the U.S. attorney's office in Kansas.

An evidentiary hearing in May had been recessed to allow the parties to work toward a resolution. Brannon says the deputy attorney general effectively ended the negotiations on Friday.

The investigation by the court-appointed special master stems from a prison contraband case during which criminal defense lawyers discovered that the privately run Leavenworth Detention Center was routinely recording meetings between attorneys and their clients.