RNC Day 4: Trump delivers longest acceptance speech in history

The arena immediately rose to its feet for the former Fox host.

Tucker Carlson, who did not use a teleprompter, talked about how last week's assassination attempt resulted in a "transformation" in the former president.

"He was no longer just a political party's nominee, or a former president or a future president. This was the leader of a nation," he said.

Carlson said he spoke with Trump immediately after the shooting and the former president said he was amazed the crowd did not run away.

"This is the most responsible, unifying behavior from a leader that I've ever seen," he said.

Carlson and Fox News agreed to part ways last year following the network's $787.5 million settlement agreement with Dominion Voting Systems.

Dominion accused Fox News in a lawsuit of knowingly pushing false conspiracy theories that the voting machine company rigged the 2020 presidential election in Joe Biden's favor.

When Trump takes the stage tonight, sources close to the former president tell ABC News he will have on stage with him a helmet and firefighter jacket that belonged to Corey Comperatore, who was killed during the attempted assassination on the former president in Butler, Pennsylvania.

ABC News has reached out to Comperatore's family for comment.

As a video played on the big screen about Trump encouraging Republicans to "protect" the vote, several people in the crowd were clapping their hands and whooping.

Trump stood standing while the video played.

A "we love Trump" chant broke out after it ended.

Country music star Jason Aldean was seen in the front row of Trump's VIP box tonight. Trump stood next to him upon arriving at the convention earlier.

Aldean recently dedicated his song "Try That in a Small Town" to Trump in the wake of the assassination attempt.