Washington, July 15: A day after the assassination attempt on his Republican rival Donald Trump Saturday, US President Joe Biden said it was time to "cool down" political rhetoric in the country as such violence cannot be normalised.

Biden, in a special address from the White House Oval Office on Sunday, said: “There is no place in America for this kind of violence — for any violence. Ever. Period. No exception. We can’t allow this violence to be normalised. It's time to cool it down."

This was Biden's third use of the formal setting of the Oval Office to comment on issues of major importance to Americans since he took power in 2021. It was also his third address in less than 24 hours since the attack on Trump.

Former US president and presumptive Republican presidential candidate Donald Trump was speaking at an election campaign rally in Pennsylvania, when he was shot at -- an attack that killed one attendee and seriously injured two more.

“I want to speak to you tonight about the need for us to lower the temperature in our politics and to remember, while we may disagree, we are not enemies we are neighbours, friends, coworkers, citizens, and most importantly, we are fellow Americans," Biden said in his six-minute address.

He also said the attack “calls on all of us to take a step back, take stock of where we are and how we go forward from here".

Condemning acts of violence, Biden said: “A former president was shot and an American citizen killed for simply exercising his freedom to support the candidate of his choosing. We cannot… we must not go down this road in America. We've travelled before throughout our history. Violence has never been the answer."

“In America, we resolve our differences at the ballot box. Now that's how we do it. At the ballot box. Not with bullets," Biden added.

His warning comes hours after FBI Deputy Director Paul Abbate said agents have seen increasingly violent rhetoric online since the attack at the Trump rally. Biden also said he had ordered “an independent review of the national security at yesterday’s rally to assess exactly what happened.”

Biden said he had “no doubt” that Republicans will “criticise my record and offer their own vision for this country".

He also promised to campaign laying out his own ideas and said the disagreements must remain peaceful. “We can do this,” Biden said.

“American democracy — where arguments are made in good faith. American democracy — where the rule of law is respected. Where decency, dignity, fair play aren’t just quaint notions, they’re living, breathing realities," he added.

Speaking about political tensions being flamed by a balkanized media environment, he said" "Here in America we need to get out of our silos, where we only listen to those with whom we agree, where misinformation is rampant, where foreign actors fan the flames of our division to shape the outcomes consistent with their interests, not ours."

Earlier, the Democratic Party's presidential candidate said he had a short but good conversation with Trump on Saturday night and that he is “sincerely grateful that he is doing well and recovering.”

Meanwhile, Trump posted on his social media account after Biden's remarks and said: “UNITE AMERICA!”

Speaking at the White House, Biden said he had directed the Secret Service to review all security measures in place for the Republican National Convention in Milwaukee this week where Trump will be formally nominated as the party’s presidential candidate to face Biden in the November 5 election.

Pausing his schedule to manage the immediate response to the shooting, Biden called off a trip to Texas on Monday for a civil rights address. He is expected to go to to Las Vegas on Tuesday for a speech.-Agencies