Trump to give RNC keynote, says he'll stress 'unity' after assassination attempt

Former President Donald Trump will formally accept the GOP presidential nomination Thursday night and deliver his first speech since Saturday's assassination attempt, capping off an ebullient Republican convention at a time of heightened political uncertainty.

Trump will give the keynote remarks at a time when he is pushing for a more unifying message after last weekend's shooting and as he rides political tailwinds into the summer and fall, fueled in part by President Joe Biden's calamitous June debate and subsequent Democratic angst.

Such a tone would mark a departure both for Trump individually and for American politics writ large, though operatives and conventiongoers alike predicted a more subdued speech focused on uniting the country, with the nation captivated by news of the attempt on the former president's life in Butler, Pennsylvania.

"I think he's a changed man. Anytime you come within millimeters of your life, that has an effect. I think, from his standpoint, he doesn't want to be a divisive figure. He wants to be a unifying figure at a time that the country is desperately seeking unity and needs unity," said Bryan Lanza, a former Trump campaign official who remains in touch with his current team.

"It's just not a moment for him, and it's just not a moment for the Republican Party. It's a moment for the country," he added. "We experienced a shock. We could literally be at a funeral today."

Trump said he revised his remarks after Saturday's shooting, saying it initially was set to be a "humdinger" but that now it will be "more of a unity speech."

In an era when few thinks punch through the political noise, particularly in a race between a current and former president with virtually universal name recognition, the speech marks a rare moment where Trump can hold the stage at a pivot point in the race, even as it's unclear precisely how much the election's dynamics have changed.

"When you're at this level, there's just certain speeches that the world stops and listens to, and your nominating speech is one," said veteran GOP strategist Chip Saltsman.

"Unity" has been the buzz word since Saturday, with leaders of both parties lamenting the violence and urging renewed civility in the country's politics.

However, such a tone could also help Trump politically, operatives predicted.

While in office, Trump bled support from centrist, suburban voters -- enough to cost him reelection in 2020. Their defection was widely attributed more to tone than to policy disagreements, and now, with polls showing Biden with hefty disapproval ratings, a more leveled approach from Trump could help win some voters back to his side, including by detailing the immediate aftermath of the shooting, strategists said.

"How do you get the Republicans that don't particularly like you? How do you get the true undecideds and independents? And how do you get the Democrats that aren't happy with Joe Biden? Obviously, those are typically issue-type conversations, but I think in this case he can do it with his emotion," Saltsman said.

To be certain, Trump is still widely anticipated to go after Biden's record, prosecuting the kind of contrast on policies that he's been putting forth since the election began.

"I expect to hear about Afghanistan withdrawal and the economy and the border and these big picture issues that have formed around this campaign," said one former senior Trump administration official. "A lot of the things that I think he covers on a regular basis in his rallies, but it'll be more surgical, if Trump's capable of surgical."

"I do think you'll see him add Kamala in a good amount to the Biden criticisms. I think that news today makes it clear that they're still pushing on that, and President Trump's pretty keen to this as an option for them," the person added, referencing growing chatter around Democrats' calls for Biden to drop out of the race.

And it's still unclear precisely how long the veneer of unity can last. Politics has morphed into a blood sport in the U.S., and those working for both candidates may be more willing to push the envelope when going after their opponents.

"I'll be honest, it's not gonna be the tone you hear from the rest of us, we're seasoned operatives. We fight, and that's how you gain position is by fighting," Lanza said.

Interviews with conventiongoers showed an appetite for both unity and Trump's typical punchiness.

"Peace and unity because it's a very divided country right now," Awet Gebremariam, a delegate from California, said when asked what she wants to hear from Trump. "He almost lost his life. And I think he's very subdued and he's very reserved and he's very grounded now. And I think he's going to give a great, great speech, maybe very different from the speeches before he used to give before."

Others, like Daniel Bobay, an alternate delegate from Texas, wanted more of a mix, arguing that "you can fight nicely."

"I'm hoping," Elizabeth Hines-Ferrick, a delegate from Massachusetts said, when asked if she wanted the rhetoric toned down. "But at least I still expect him to be a fighter, because he speaks straight from the heart."

Politically, Democrats concede a more unifying tone from Trump could make it harder to knock him as a threat to democracy, especially after the shooting, even if they're skeptical he can keep it up long after the GOP convention.

"I think there's an initial concern that if Trump can play this the right way that he can look like a unifier and get outside of his brand," one battleground Democratic strategist said. "But then also at the same time, I would tell you that no one has any confidence that he can continue to play the straight man."

As far as Thursday goes, however, Trump is virtually guaranteed a hero's welcome, no matter what he says.

"I think it's gonna be pretty epic," the former senior administration official said. "Everyone in that hall loves the man, and him speaking to them for the first time since Saturday is going to have a pretty raucous atmosphere. I imagine it's gonna be emotional. You're gonna see delegates teary-eyed and hooting and hollering."

ABC News' Jonathan Karl contributed to this report.