"There are certain areas which ISIS has the oil and you take the oil, you keep it. You just go in and take it."

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Walls are very important when you`re separating two urban areas where if you`re actually able to get over the border you can probably get into the underground network in about 30 seconds. But when you`re out in the middle of the desert, it makes no sense because you have border security people have up to a day to apprehend people who are crossing illegally.

— John Yarmuth