Yes, but there’s only so much he can do. Of course there are things he can do to prepare for violence, both directly and in coordination with state governors. That said, if people want to protest, they’re going to protest. The way things are, there’s a fine line between maintaining the peace and oppression. Republicans have, for years, been laying the groundwork for the oppression argument. It’s easy to say, “who cares” to that, but if enough people think they’re being oppressed by the government, things will get more violent.