Chris Wallace was joined on "Fox News Sunday" by Lt. Gen. Michael Flynn (Ret.), former director of the Defense Intelligence Agency, to discuss the new national security strategy released by the Obama administration on Friday and the growing threat of Islamic extremism.

"We are facing a form of a cancerous component of the Islamic religion which has a fanaticism to it ... which is against our way of life, and they, in fact, have declared war on us," Flynn said.

"I really do believe that when members of Congress are yelling at the White House for strategy and the White House is talking back to them, I think what they really need to do is they need to sit down and figure out what is our strategy going forward."

Flynn explained that there has been a doubling or more of number of radical Islamic enemies over the past 10 years. He said we need to recognize that our strategy has not been working.

"We need a much broader strategy that recognizes that we're facing not just this tactical problem of Iraq and Syria," Flynn explained.

"We're facing a growing, expanding threat around the world in some cases, particularly in the trans-region of the Middle East, Central Asia, North Africa and sub-Saharan Africa."

Flynn said we need to first define the enemy, then articulate a strategy that is broader than just counterterrorism.

"This is more than just something that's going to be solved in the next two years. This is going to have to take 10 years, maybe an entire generation or more."

Watch more above.