Both. It really is a significant offense, but politicians on both sides are doing it almost constantly (for example, https://www.nytimes.com/2017/09/25/us/poli

Both. It really is a significant offense, but politicians on both sides are doing it almost constantly (for example, https://www.nytimes.com/2017/09/25/us/politics/private-email-trump-kushner-bannon.html https://www.nytimes.com/2017/09/25/us/politics/private-email... ) and no fuss is raised. I guess the “official” US gov email system is really just a huge pain to use.