President Donald Trump took the stage at the memorial service honoring Charlie Kirk, the 31-year-old conservative youth activist who was assassinated during an event at a Utah college, describing him as a "American hero" and one of the nation's "greatest patriots." 

"This is like an old-time revival, isn't it? An old-time revival," Trump said on stage before tens of thousands of people. "He devoted his life to converting young people to the conservative cause. How did he do? Take a look."

Trump also said of Kirk: "He's a martyr now for American freedom."

Almost all members of the cabinet were present at the event to honor Kirk, including Attorney General Pam Bondi, Secretary of State Marco Rubio, Education Secretary Linda McMahon and Secretary of Defense Pete Hegseth. Trump has ordered the renaming of DoD to the Department of War, but Congress has not adopted the term yet.

Tesla and SpaceX CEO Elon Musk, the former head of the Department of Government Efficiency, was also spotted at the member along with GOP members of the House and Senate.

Kirk’s widow, Erika Kirk, will be taking over as CEO of the organization her husband co-founded, Turning Point USA (TPUSA).

She told the attendees at the service that she forgives Kirk's killer. 

"I forgive him because it was what Christ did. And it is what Charlie would do," she said.

Trump shared the stage with Erika at the conclusion of the ceremony while America the Beautiful was being sung. 

Trump predicted that Turning Point USA would be "bigger and better than ever before." 

Organizers said they are expecting about 100,000 people to attend the event at the arena, which is home to the Arizona Cardinals football team.

Grammy Award-winning recording artist Taylor Swift kicked off her Eras tour at the same venue. 

The U.S. Secret Service led a heavy security operation for the event, with some comparing it to Super Bowl-level protection. 

On Saturday, an armed man was arrested at the venue after reportedly claiming he was law enforcement. Later, TPUSA said the man was part of a private advance security team for a known guest.