. Add to Kushner the fact that Trump uses unsecured cell phones, and the Ukraine scandal has revealed that multiple State Dept. officials also use personal emails and messaging for official business.
Personal emails, hell, Trump uses his personal lawyer to conduct official business with Ukraine. Leading to pretty obvious conflicts of interest (and impeachment proceedings).
As for keeping gov't info safe, my memory is getting a little hazy, but wasn't it confirmed that the State Dept servers were targeted for multiple times and hacked into to some degree, while I've never heard of Hillary's server having been breached. I'll have to check on that, but that's what I recall (which was of course a non-story). I seem to recall watching a debate and waiting for Hillary to mention that the State Dept was hacked an dher server never was ...
Of course that doesn't get to the law, and a big part of the law is record-keeping. Otherwise I find it interesting that Trump officials communicate by email up to a point and then when things get dicey, they say let's stop discussing this here (in writing) and talk on the phone (where no record will exist). It's probably standard DC practice, but also somewhat shady.