Thousands of mourners, including President Donald Trump, attend the memorial service for conservative activist Charlie Kirk on Sunday.

A memorial service for conservative activist Charlie Kirk is set to feature President Trump, Vice President JD Vance, Erika Kirk and others on Sunday at State Farm Stadium in Arizona.

President Donald Trump and his supporters are set to pay tribute to conservative activist Charlie Kirk, whose assassination has intensified political tensions in the United States. The 63,400-seat State Farm Stadium in Arizona quickly filled up Sunday with people dressed in red,

Kirk, who was assassinated Sept. 10, reached millions through his conservative talk show and college campus debates.

A drone view shows people gathering to pay tribute to slain conservative commentator Charlie Kirk at the headquarters of Turning Point USA, ahead of a memorial service for him which is to be held on September 21,

While speaking at Charlie Kirk's memorial, President Donald Trump said violence comes "largely from the left." Trump said Kirk talked to him about his previous death threats, but told Trump he "knew the risks" but would "never back down.