Harry Reid said "there is no question about it" after the Pentagon confirmed the leaked footage was genuine.
A triangle or pyramid-shaped object was filmed hovering high above the missile-carrying destroyer USS Russell in July 2019.
A Department of Defence spokeswoman also confirmed the video was being investigated by the Pentagon’s Unidentified Aerial Phenomena Task Force.
Senator Reid told Mystery Wire UFO news site: "They are coming in swarms, like bees, like insects, so many of them."
Asked over the possibility the UFOs were advanced Chinese technology, he said: "Always remember Russia, the Soviet Union, is run by a man who ran the KGB.
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