Chairman of the House Homeland Security Committee Michael McCaul joined Maria Bartiromo on "Sunday Morning Futures" to react to U.S. Special Forces personnel killing a key ISIS leader in a raid in eastern Syria.

"It’s a very significant development. I applaud our Special Forces putting themselves in danger and taking out one of the most high value targets within the ISIS organization," McCaul said.

McCaul described the target of the raid, Abu Sayyaf, as the "chief financial officer of ISIS."

"He was in charge of the oil and gas reserves which funded their operations," McCaul said. "So we're trying to cut the funding stream off from the terrorist financing."

"In addition, we discovered a treasure trove of electronic information and documents and records relating to the organizational structure of ISIS, which will help us long-term in taking out the command and control structure from within," McCaul revealed.

Is the treasure trove of information more important than the disruption of oil being sold on the black market? Bartiromo asked.

"I think anytime you take out a high-value target, that’s a setback, but I do think the discovery of these electronic records and documents [is] probably by far the greatest achievement, because now we can look at the organization itself, where the tentacles reached both as far as Syria and outside Syria," McCaul said. "The best defense to defend the homeland is a good offense, and we need to take them out wherever they exist."

"I think these documents and computer records will help us to do that."

Watch the full "Sunday Morning Futures" interview above.

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