We were reminded, too, that unity is imperative in America. It is essential to our shared prosperity, our national security, and to our standing in the world,’ Harris said.Harris, a Democrat, followed Bush, a Republican, who used his speech to condemn ‘violent extremists abroad and violent extremists at home,’ calling them ‘children of the same foul spirit’ – an apparent reference to both the 9/11 hijackers and the January 6 Capitol insurrectionists.