The Brussels attacks represent a new terrorist strategy that will be challenging for law enforcement to tackle, a former TSA assistant administrator said Thursday.
The deadly bombings in the departure hall at Brussels' main airport, for which ISIS claimed responsibility, marked a shift from attempting to get prohibited items through checkpoints and onto airplanes to targeting a lower-security area of a public space, Chad Wolf told CNBC's "Squawk Box."
The Transportation Security Administration's primary response will be to temporarily increase the law enforcement presence in these vulnerable areas, he said.
"Measures like that of a little bit of a random nature is really what the right response is going to be," he said. "Outside of that, you're going to continue to create more lines, more choke points if you try to institute more aggressive measures."
The United States would face significant costs if it were to adopt airport security measures like those in Israel, where agents approach travelers in the departure hall and question them, Wolf said. He noted that there are hundreds more airports in the United States.