President Donald Trump and other prominent American political figures are heading to Arizona to speak at a memorial for Charlie Kirk, the 31-year-old conservative activist who was killed two weeks ago.
The event, organised by Turning Point USA, is on Sunday at State Farm Stadium in Glendale and could be attended by more than 100,000 people.
Heightened security is expected. An armed man was arrested on Friday outside the stadium, officials told BBC's US partner, CBS News, although why he was there is unknown.
Kirk, who co-founded Turning Point USA when he was 18, was shot at a speaking event on a Utah university campus on 10 September, reigniting concerns about political violence in the US.
A polarising figure, differing perspectives about his legacy and possible motives for the shooting have exacerbated deep divisions in the US.
