(CNN) — Ben Carson says he wouldn't use drones to kill undocumented immigrants -- but he'd order strikes on the caves used to transport people across the United States' southern border.
"There are caves that they utilize. Those caves can be eliminated. There are a number of possibilities -- that could be one of them," Carson told CNN's Jim Acosta Sunday on "State of the Union."
He added emphatically: "I'm not talking about killing people. No people with drones."
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Carson, a retired neurosurgeon who is now among the top polling candidates for the Republican presidential nomination, also proposed using military strategists and the National Guard to secure the border.