WASHINGTON (AP) — The U.S. government's top hostage negotiator defended prisoner swaps that free Americans wrongfully detained by foreign countries in exchange for the release of convicted criminals, denying on Thursday that such deals incentivize additional arrests of U.S. citizens.

“The math just is not adding up — it’s actually going down, it's going in the other direction,†Roger Carstens, the special presidential envoy for hostage affairs, said of the population of wrongfully detained Americans.

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