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Theuses for in some limited law enforcement situations, Director Robert Mueller said on Wednesday, sparking additional debate about President 's use of .
The acknowledgement came in response to questions from U.S. senators who said they wanted to know more about the federal government's increasing use of.
"Does the FBI use drones for surveillance on U.S. soil?" Republican Senator Charles Grassley of Iowa asked during a Senate Judiciary Committee hearing.
"Yes," Mueller said, adding that the use was in "a very, very minimal way and very seldom."