Mr. Rumsfeld had not been intimately involved in developing the plan for prosecuting terrorist suspects.
The British counterterrorism authorities say they cannot move too quickly to break up plots because they need enough evidence to prosecute suspects successfully.
Mr. Kelly said the department would begin prosecuting suspects in cases involving guns or drugs in federal court, where sentences are harsher.
And it will need to prosecute drug-trafficking suspects already in its legal jurisdiction.
Mr. Baxley chose not to prosecute other suspects at that time, in the hope that better cases could be developed against them later.
They have uncovered specific threats and prosecuted suspects, though Germany itself has been largely free of terror incidents.
Police said they did not have enough evidence to prosecute other suspects.
This marks the first segment in which local law enforcement has declined an invitation to prosecute suspects involved in the show.
The United States must prosecute suspects, where sound evidence exists and in accordance with the rule of law.
The British government's perceived unwillingness to prosecute or extradite terrorist suspects provoked tensions with countries in which attacks occurred.