U.S. President George W. Bush has selected acting Food and Drug Administration (FDA) chief Andrew von Eschenbach as his nominee to become the permanent commissioner of the health agency, the White House said Wednesday. Von Eschenbach has been acting FDA commissioner since September, when his predecessor resigned only three months after taking the job. The nomination, which must be approved by the U.S. Senate, may revive debate over recent concerns faced by the agency over drug safety.