Speaking at the Sept. 11 remembrance event at the Pentagon, President Trump expressed "horror and grief" he and other Americans have over the "heinous assassination" of conservative figure Charlie Kirk on Wednesday. "Charlie was a giant of his generation, a champion of liberty, and an inspiration to millions and millions of people," Mr. Trump said. "Our prayers are with his wonderful wife Erika and his beautiful children. Fantastic people, they are." Watch full speech.