Former New York City Mayor Rudy Giuliani joined Greta Van Susteren tonight to react to the death of NYPD Officer Randolph Holder, who was shot and killed while chasing a gunman during a gang battle in Harlem.

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Giuliani said there is no doubt that there's a war on police officers, not just via acts of violence like what occurred in New York City Tuesday night, but also through the anti-police rhetoric used by groups like Black Lives Matter and the policies instituted by some cities' leaders.

"Every time you see a police officer, you should be saying, 'Thank you for putting your life on the line, for protecting me and my children,'" Giuliani said.

He added that most Americans feel that way, but there is a small group of people, including some in high-level political positions, who are allowing the anti-police movement to grow.

"You cut back on stop-and-frisk, you don't give these people the sentences they deserve, you let these people out of prison because you start feeling sorry they've been in prison too long," Giuliani said.

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