Interestingly, this is the EXACT advice [1] given at the Apple + FBI @ U.S. Congressional Hearing on March 1st from California congressman Darrell Issa (R).
Congressman Issa was previously the CEO of DEI, a car security and audio equipment company. He is possibly one of the most tech-savvy members of U.S. Congress and happens to be one of the wealthiest as well [2].
The Congressional hearing video footage is here, the suggestion was proposed at 1h23m 13s in.[3]
[1]: http://qz.com/628745/i-have-no-idea-the-fbi-director-at-the-...