A Los Angeles attorney, Stephen Larson, says he plans to file a brief in the legal battle on behalf of at least several families of victims and other employees in the shootings in San Bernardino, California.
Larson is a former federal judge who says he was asked by federal prosecutors to take on the case.
Larson says the victims want to know what's on the county-issued iPhone used by the gunman, what might pertain to them and why they were targeted.