Former New York Mayor Rudy Giuliani weighed in on "Hannity" about the rise of radical Islam and why the Obama administration still has not said that the U.S. is at war with Islamic jihadists. 

"Sean I think it's very serious," Giuliani said. "I think it's very serious, because it sends a signal of cowardice and weakness to these people. I am saying this from 40 years of experience of investigating and prosecuting Islamic terrorism, going back to the Palestinian hijackings in the 1970s."

Giuliani added that "if we can't use the words radical Islamic terrorism, we can't get rid of them." 

"We should be able to say it and then we should have the decent members of the Islamic religion be even angrier at the fact that there is radical Islam than you and I are," Giuliani stated. 

He told Hannity that he knew "New York City would be safe for a while, because President George W. Bush hit terrorists in Afghanistan, putting them on defense." 

"You put them on defense, you don't do what Obama does," Giuliani said. "You don't show reluctance to use their name. You don't show reluctance to march with world leaders who are marching against radical Islamic terrorism [...] I believe he didn't go because he didn't want to make a statement against radical Islamic terrorism." 

Watch more of the captivating discussion above.