Chief Cabinet Secretary Yoshihide Suga told a news conference that dolphin fishing in Japan is carried out appropriately in accordance with the law.
"Dolphin fishing is a form of traditional fishing in our country," he said, responding to a question about Kennedy's criticism. "We will explain Japan's position to the American side."
Kennedy tweeted on Sunday: "Deeply concerned by in-humanness of drive hunt dolphin killing." She added that the US government opposes such fishing.
Trapped and killed
Drive hunt refers to the practice of herding the dolphins into a cove, where they are trapped and later killed.
The hunt in the fishing village of Taiji in western Japan has come under international criticism and was the subject of the Academy Award-winning 2009 film "The Cove".
The fishermen in Taiji say the hunt is part of their village tradition and call foreign critics who eat other kinds of meat hypocritical.
Picture: Dolphins from Shutterstock