Butler, July 15: Former President Donald Trump called for unity and resilience Sunday after an attempt on his life added fresh uncertainty to an already tumultuous presidential campaign and raised sharp questions about how a gunman was able to open fire from a rooftop near a Pennsylvania campaign rally.

Setting aside stark political differences during a delicate stretch of the race, President Joe Biden used a prime-time address Sunday to condemn the violence and implore Americans that "we can't, we must not go down” the road of political violence. Donald Trump Assassination Attempt: US President Joe Biden Urges Americans ‘Not To Make Assumptions’ About Shooter’s Motive; Calls for Unity (Watch Video).

“It's time to cool it down and we have a responsibility to do that,” Biden said. A full day after the shooting, the gunman's motive remained a mystery, with investigators saying they believe he acted alone before being fatally shot by Secret Service agents. Biden ordered an independent security review of the attack, which killed a bystander and critically wounded two others. The FBI was investigating the shooting as a potential act of domestic terrorism.

The attack shook the firmament of the American political system, causing a reassessment and a detente — at least temporarily — of the heated 2024 presidential campaign that has grown increasingly vicious. Trump, the presumptive Republican presidential nominee, said the upper part of his right ear was pierced by a bullet. His aides said he was in “great spirits” and doing well, and he arrived in Milwaukee Sunday evening for the Republican National Convention, which begins Monday. Donald Trump Assassination Attempt: US Law Enforcement Says ‘Bomb-Making Materials Found in Vehicle and Home of Trump Rally Shooting Suspect’.

“I knew immediately that something was wrong in that I heard a whizzing sound, shots, and immediately felt the bullet ripping through the skin,” he wrote on his social media site. “Much bleeding took place.” In a subsequent social post Sunday, Trump said: “In this moment, it is more important than ever that we stand United, and show our True Character as Americans, remaining Strong and Determined, and not allowing Evil to Win."

The rallygoer who was killed was identified as Corey Comperatore, a former fire chief from the area, according to Pennsylvania Gov. Josh Shapiro, who added that Comperatore “died a hero.” “His wife shared with me that he dove on his family to protect them,” Shapiro said. The two wounded bystanders were listed in stable condition.

Biden spoke briefly with Trump and was to address the nation Sunday evening. The president said the country would continue to debate and disagree, but stressed: "We must unite as one nation to demonstrate who we are.”

(This is an unedited and auto-generated story from Syndicated News feed, LatestLY Staff may not have modified or edited the content body)