.@DonaldJTrumpJr, my daughter was a victim of AR 15 violence in Parkland. You know that and you know some of the families. This photo and its incitement of violence only confirms you are a dangerous low life peice of garbage who may get someone killed. https://t.co/7UYAwbdWwd— Fred Guttenberg (@fred_guttenberg) January 7, 2020