Jen Psaki looks back at past examples of political violence in the United States and how political leaders addressed the country with calls for unity and cooler heads, with examples from John Boehner to Utah Governor Spender Cox,

Political violence has targeted the political left and right and has been perpetrated by the left and the right. Here's a recap since 2011.

The assassination of the political activist and founder of Turning Point USA earlier this week has shocked the world and is the latest example of the growing threats of political violence against figures on the right.