Lt. Gen. Tom McInerney was on “The Kelly File” to discuss radical Islam and possible airstrikes in Syria.

McInerney said that the mission should be to destroy ISIS, calling for a 30-day, 24/7 air campaign, but said the U.S. seems to be reluctant.

American Killed in Syria While Fighting for ISIS

“Radical Islamists are coming after us no matter what we do to them,” he said.

If the U.S. allows ISIS to expand, McInerney said, “They’ll be here maybe this 9/11, I don’t know.”

Peters on ISIS: 'We Either Act or the Price Goes Up'

Watch more above.