The Republican National Convention kicked off Monday in Milwaukee with the near-unanimous formal nomination of Donald Trump as the party’s nominee — just two days after his near-assassination at a campaign event.

Attendees were in high spirits in the swing state of Wisconsin’s Brew City as thousands of GOP delegates crowded into the Fiserv Forum to participate in a roll-call vote for their presidential and vice presidential picks, as well as to bicker over the Republican Party platform.

The room wildly cheered as a video screen announced when Trump went “OVER THE TOP” and clinched the nomination with a batch of 125 votes from Florida — even though the former president had yet to arrive at the venue.

At least 1,215 delegates needed to back Trump to solidify his 2024 candidacy. He got 2,387 of the 2,429 pledged delegates in a roll call vote.

“Let’s make it official,” House Speaker Mike Johnson (R-La.) said in celebration after the final votes were cast.

Trump, 78, considered delaying his trip to Wisconsin after he was nearly killed by a 20-year-old lone shooter at his campaign rally in Butler, Pa. — another swing state — on Saturday.

But he flew to Milwaukee the next day, saying he was determined to not let a “potential assassin … force [a] change to scheduling or anything else,” arriving with his right ear wrapped in a white bandage from the bullet that came within an inch of killing him.

Trump strode onto the convention floor, shaking hands with attendees and displaying a thumbs-up as Lee Greenwood sang “God Bless the USA.” He then headed for the VIP box where he shook hands with former Fox News host Tucker Carlson and joined others, including Johnson, Rep. Byron Donalds (R-Fla.) and his running-mate, Sen. J.D. Vance (R-Ohio).

The crowd erupted into shouts of “USA!” “We want Trump!” and “Fight!”

It’s not the first time that death has stalked a former Republican president in Wisconsin’s largest city.

In 1912, Teddy Roosevelt was shot by a crazed gunman — and finished delivering his speech before receiving any medical attention.

After Trump was shot and before he was whisked from the stage by the Secret Service, he raised his fist to the sky in defiance of the bullet that nearly finished him and called on his supporters to “Fight! Fight! Fight!”

Ahead of Trump’s arrival at the convention, the throng of Republicans on the arena floor during the first session repeated the former president’s rallying cry and pumped their fists. Congressional allies like House Speaker Johnson and Rep. Marjorie Taylor Greene (R-Ga.) and others took to the stage to support their party’s leader.

“Today is a celebration,” Greene declared. “The American spirit is alive and well, and we have once again nominated for president the founding father of the America First movement, Donald John Trump.”

Hours before Trump formally accepted the Republican nomination, he announced on Truth Social — in typical dramatic fashion — that Vance would be his running mate, who was later confirmed by a unanimous voice vote.

“I think he picked Vance because number one, he’s a military guy, Christian guy, young — needs to bring some young blood on,” Florida delegate Bill Daubmann told The Post. “Very strong, very determined, very much like himself, doesn’t give up.”

When talking about Trump’s pick, insiders had noted the native Ohioan’s fierce “loyalty” to the former president — and the senator was the first to lash out at President Biden’s re-election campaign for enabling the rally shooting with reckless rhetoric.

“The central premise of the Biden campaign is that President Donald Trump is an authoritarian fascist who must be stopped at all costs,” Vance posted Saturday on X. “That rhetoric led directly to President Trump’s attempted assassination.”

Biden, 81, in an Oval Office address on Sunday urged all Americans to help “lower the temperature in our politics” — and Trump told The Post he would make the case for trying “to unite our country” in his RNC speech redrafted in the wake of the shooting.

“Our prosperity, our security,” freshman Sen. Katie Britt (R-Ala.) said during her speech, “each diminished, all in decline. Just like the man in the Oval Office.”

Republican delegates also guffawed at video footage of Biden stumbling and unable to put on his sport coat that aired on the jumbotron, attacking his “incompetence” — and the air was electric with the news of Trump’s vice presidential decision followed by spirited speakers like onetime running-mate contender Sen. Tim Scott (R-SC).

“Our God still saves. He still delivers. And he still sets free,” the evangelical senator shouted from the main stage. “Because on Saturday, the devil came to Pennsylvania holding a rifle. But an American lion got back up on his feet and he roared.”

“The spirit of hope is spreading,” Virginia’s Republican Gov. Glenn Youngkin concurred, predicting that his would be one of several blue states to flip red in 2024. “Everyone can feel it.”

Scott later drew the loudest shots of agreement over the course of the second session Monday night when he proclaimed, “America is not a racist country — but if you were looking for racism today, you’d find it in cities run by Democrats.”

Florida Sen. Marco Rubio and North Dakota Gov. Doug Burgum, who had topped the former president’s shortlist during the final weeks of the veepstakes, were informed earlier in the day that they would not be his final pick.

Delegates disagreed about little over the course of the first day’s sessions, though there was a loud shot of “no” when voting on the adoption of the Republican platform, which included no mention of the ongoing Russia-Ukraine war and had softened some of its language around abortion from previous years.

Outside the security bubble that covers several city blocks, including the convention center, crowds of left-wing demonstrators protested against the GOP, waving flags that declared support for the anti-Israel movement, pro-abortion rights, ending the blockade on Cuba, and more.

“No Trump, no KKK, no fascist USA!” they chanted as they marched, with some holding signs that slammed Trump’s conservative Supreme Court justice and called for “Ballots Not Bullets.”

Day One of the RNC also featured musical performances by Chris Janson and speeches from high-profile party figures such as North Carolina Lt. Governor Mark Robinson, Rep. Wesley Hunt (R-Texas), Rep. John James (R-Mich.), Sen. Marsha Blackburn (R-Tenn.) CEO of Goya Foods Bob Unanue and South Dakota Gov. Kristi Noem.

Other notable speakers included former CEO of Yammer David Sacks, CEO of Turning Point USA Charlie Kirk, entrepreneur and model Amber Rose and President of the International Brotherhood of Teamsters Sean O’Brien — a historic first for the union leader.

Trump’s son Eric told Fox News after the nomination that his father’s opponents have “gone after” their family “since when he went down that escalator,” referring to the Republican candidate’s infamous entry into the 2016 presidential primary.

“They have done everything to try and strip him of his wealth and of his fame. They have tried to break up our family,” he said. “They literally tried to kill him this week. And despite that he is undeterred.”

Trump will officially accept the Republican Party nomination in a Thursday night primetime address.