US President Donald Trump and other officials paid tribute to slain right-wing activist Charlie Kirk on Thursday as the country marked the 24th anniversary of the September 11, 2001 attacks.
Kirk was a "giant of his generation," and a "champion of liberty," Trump said at the beginning of his remarks during a 9/11 ceremony at the Pentagon, which was one of the targets of the Al-Qaeda attacks that sparked two decades of deadly conflict.
