FBI Director James Comey, writing on Lawfare:
The San Bernardino litigation isn’t about trying to set a precedent or send any kind of message. […]
The particular legal issue is actually quite narrow. The relief we seek is limited and its value increasingly obsolete because the technology continues to evolve. We simply want the chance, with a search warrant, to try to guess the terrorist’s passcode without the phone essentially self-destructing and without it taking a decade to guess correctly. That’s it.