The issue focused on one at a time, and it was not in the interest of many people.

"It is part of this political climate that we are trying to make really hard for them to have an opportunity to work with us," he said. "We need to do more."

In New York City, where police use force after three mass shootings in 2016, non-violent protests were marred by violence. In March, 18-year-old James Alex Fields Jr. was shot dead