President Biden has said there is "no place in America for this kind of violence" after an apparent assassination attempt on Donald Trump.
"It's sick. Sick," he said in a press briefing in Delaware, following the attack on the Trump event in Pennsylvania.
The US Secret Service confirmed a suspected gunman fired "multiple shots" from an "elevated position outside of the rally venue".
They said the gunman had been "neutralised" and was now dead. The agency also confirmed a spectator had been killed and two others critically injured.
READ ALSO: In pictures: How Trump shooting unfolded
"We cannot allow for this to be happening," President Biden said.
He thanked the Secret Service, adding: "Everyone must condemn it."
Mr Biden said he had tried to contact Trump following the shooting.
"I tried to get a hold of Donald - he's with his doctors," said the president. "Apparently, he's doing well. I hope I get to speak to him tonight."
The Secret Service said Trump was now "safe" and that it had implemented protective measures around him.
It said it was treating the incident as an assassination attempt.
Trump wrote on social media that a bullet had pierced the upper part of his ear.
"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 said on his Truth Social platform.
"Much bleeding took place, so I realised then what was happening.
"I want to thank The United States Secret Service, and all of law enforcement, for their rapid response," he added.
"Most importantly, I want to extend my condolences to the family of the person at the rally who was killed, and also to the family of another person that was badly injured.
"It is incredible that such an act can take place in our country."
Trump's campaign said he was "fine" following the incident.
"President Trump thanks law enforcement and first responders for their quick action during this heinous act," spokesman Steven Cheung said.
"He is fine and is being checked out at a local medical facility. More details will follow."
The incident happened as the former president was speaking at a rally in Pennsylvania. Suddenly, he appeared to fall to the ground clutching his ear.
Skynews