We've come close to this already (mandated Clipper chip). Which would have been a disaster, in many areas. IIRC, the ITAR rules even prohibited systems that la

We've come close to this already (mandated Clipper chip). Which would have been a disaster, in many areas. IIRC, the ITAR rules even prohibited systems that lacked crypto, but that had pluggable APIs which permitted crypto to be added later (e.g., by the end-user). It's hard to see how legislation to the same effect would pass constitutional muster, but it's a gamble, and the administration has little to lose.