Kamala Harris and George W Bush call for unity on 20th anniversary of 9/11 – video

Speaking at the Shanksville memorial ceremony, Kamala Harris called for the US to come together, as passengers and crew of Flight 93 did on 9/11 to fight the hijackers. She was joined by former president George W Bush, who also criticised the divisiveness affecting the US, saying that it turns 'every argument into a clash of cultures'.