Sunday's memorial service for the slain activist also served as a faith-based argument for American conservatism, with many speakers calling Kirk a "martyr."

Mourners including Elon Musk honored the life of prominent conservative activist Charlie Kirk, 31, at a memorial service in Glendale, 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 is being laid to rest at a public funeral following his assassination earlier this month.

President Trump wrapped up a long list of speakers at Charlie Kirk's memorial in Glendale, Ariz., where political and religious leaders praised his faith and political influence. NBC News' Garrett Haake reports from the packed State Farm Stadium.

Cabinet officials, right-wing pundits and Christian pastors eulogized Kirk during the hours-long service, which came nearly two weeks after the conservative activist was shot to death. His death ratcheted up political tensions across the country and heightened fears that American politics had entered a dangerous new era.

Elected officials, faith leaders, Kirk's colleagues, and his loved ones addressed the crowd at State Farm Stadium, with thousands of supporters holding up signs and chanting "USA." The crowd cheered former Kirk Chief of Staff Mikey McCoy as he quoted theologian and philosopher Søren Kierkegaard: "The tyrant dies and his rule is over.