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President Trump in New York City on June 9. Photo: Saul Loeb/AFP via Getty Images

President Trump is demanding Congress attach his sweeping voting overhaul to legislation renewing a key U.S. surveillance authority.

Why it matters: Section 702 of the Foreign Intelligence Surveillance Act is among the government's most contested surveillance authorities, long opposed by privacy advocates and supported by security hawks. Its fate now hinges on Trump's unrelated demands for a voting bill.