Appearing on Fox News Sunday, Department of Homeland Security Secretary Kirstjen Nielsen condemned the mass shooting at Pittsburgh's Tree of Life Synagogue as "a pure act of evil," and added that DHS officials had actually conducted a site visit to the synagogue in March to advise on active shooter scenarios.

The big picture: Asked by host Chris Wallace if President Trump bears any responsibility for the recent spike in political violence, Nielsen said that while First Amendment rights should always be protected, there is a line: "When those choose to use the First Amendment to incite violence, to incite disruption, rather than being constructive...to have conversations that instead tear Americans apart, I do not support that."