Washington DC, Sept. 11 -- US President Donald Trump has described the killing of right-wing political commentator and conservative activist Charlie Kirk a "dark moment for America" and accused the "radical left" of inciting such political violence across the country.

In an address late Wednesday (local time), Trump paid tribute to Kirk, calling him a "patriot" and a "martyr for truth and freedom", while expressing condolences to Kirk's wife Erica and their two children.

The prominent right-wing commentator and founder of Turning Point USA, was fatally shot in the neck while speaking at Utah Valley University on Wednesday, as reported by The New York Times.

"To my great fellow Americans, I am filled with grief and anger at the heinous ...