Michael Cheika’s behaviour during England match under investigation

Michael Cheika's conduct during Australia's 30-6 defeat by England at Twickenham has been referred for investigation by World Rugby.
The Wallabies head coach was infuriated by a number of refereeing decisions and when a Michael Hooper try was disallowed in the first half, he appeared to mouth "f***ing genius" in reference to the decision made by referee Ben O'Keeffe.