The government says you can’t know how many people U.S. drone strikes have killed, because that’s a state secret. But one of the most hawkish members of the U.S. Senate just said the strikes have killed 4,700 people. And his math raises questions.

That’s what Sen. Lindsey Graham (R-South Carolina) approvingly told an Easley, South Carolina, Rotary Club on Tuesday afternoon. It’s the first public death toll provided by a U.S. government official for the signature method of killing in the U.S.’ sprawling, global counterterrorism campaign.

“We’ve killed 4,700,” Graham said, according to an Easley website. “Sometimes you hit innocent people, and I hate that, but we’re at war, and we’ve taken out some very senior members of al-Qaida.” Graham did not evidently offer an estimate of how many innocent people the drones have killed.