A California judge has ordered Apple to help investigators unlock the iPhone of one of the San Bernardino shooters, Syad Farook.

In a Tuesday ruling, Magistrate Judge Sheri Pym required the tech company to supply the FBI with software that can workaround the passcode block on the phone to access data.

Authorities say data that may be on the phone is crucial to their investigation. But Apple opposes the move. In a letter posted Tuesday, CEO Tim Cook called it an "unprecedented step" that "threatens the security of [its] customers."

For more, we're joined by Jack Lerner, Director of the Intellectual Property, Arts, and Technology Clinic at UC Irvine; and Erroll Southers, Director of the Homegrown Violent Extremism Studies Program at the University of Southern California.