Trump arrives in Milwaukee after assassination attempt as FBI races to establish shooter’s motive.

LiveTrump called on America to ‘stand united’ after the shooting at his rally in Pennsylvania.

Former president Donald Trump arrived in Milwaukee on Sunday evening for the Republican National Convention, while president Joe Biden implored Americans to “cool it down” in the final stretch and “resolve our differences at the ballot box”.

A full day after the shooting, the gunman’s motive remained a mystery, with investigators saying they believe he acted alone before he was fatally shot by Secret Service agents.

Mr Biden ordered an independent security review of the attack, which killed a bystander, critically wounded two others and prompted questions about how a gunman was able to open fire from a rooftop near a Pennsylvania campaign rally. The FBI was investigating the shooting as a potential act of domestic terrorism.

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.

In a post on his social media site, 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.”