There have been several massive violent anti-Trump protests. While I am not aware of any fatalities involved some people got seriously injured, including an anti-Trump protester shot in Seattle and several pro-Trump people who had sought to attend a Milo Yiannopoulos talk at UC Berkeley.
I presume it was events of this nature that had motivated an armed militia to be present at a recent pro-Trump rally in Downtown Atlanta. According to reports, the rally went smoothly and while some anti-Trump counter demonstrators were present in the vicinity, no violence took place.
Read more at the link:
http://www.zerohedge.com/news/2017-02-18/trump-supporters-rally-downtown-atlanta-semi-automatic-weapons