The man who mailed 16 packages of inoperative pipe bombs packed with fireworks powder and shards of glass to 13 famous Democrats and CNN faces sentencing.
Traditional methods of using undercover sources and intercepting communications are largely ineffective against lone-wolf terrorists.
The man accused of sending pipe bombs to prominent critics of President Donald Trump is expected to make his first court appearance Tuesday in New York.
Cesar Sayoc, the man accused of sending mail bombs to several prominent Democrats, kept a "hit list" of more than 100 potential political targets.
The suspect in a string of mail bombs targeting prominent Democrats was essentially homeless, living in his van and building his devices in the vehicle.