Former New York City Police Commissioner Bernard Kerik said Wednesday U.S. security officials are doing a better job of protecting Americans than ever before, but a Paris-style attack will take place in the United States.
"That's going to happen here. Eventually they're going to get through. We're going to miss one of these things, and they're going to get through and pull off a stunt like this," he told CNBC's "Squawk Box."
"Intelligence is going to be the success or failure of us preventing these attacks."
The extremist group ISIS claimed responsibility for the deadly terror attacks in Paris.
Kerik, who was police commissioner during the Sept. 11 attacks on New York, compared preventing a terror plot in the United States to fighting drug cartels in the 1970s and '80s.
"We do this, they do this. We do that, they do this. It's a constant, moving thing that we have to be prepared for, and we're doing the same thing in terrorism," he said.