John Kasich is right about the challenges posed by strong, widely available encryption. But there is essentially nothing that can be done about it.

In the early days of the Internet (way back in 1992!) the government classified strong encryption software as a munition, and banned its export. (This was in no small part a reaction to the popularity of a program called Pretty Good Privacy.) Those rules eventually were relaxed, not because the government changed its mind but because they were unenforceable.

They’re even less enforceable now. For example, if you would like to get yourself an anonymous email account with very strong encryption and servers based in Switzerland, far from the reach of domestic snoopery, you can do so for free, and it takes about five minutes. You can pass a law against that, or ten laws, or ten thousand laws, but it isn’t going to make it any difference.