President Joe Biden breaks his silence on Donald Trump's assassination attempt after shooting at his rally

Butler County District Attorney Richard Goldfinger reportedly said one person is believed to be dead and 'possibly a second.'

He said the person believed to be dead was 'someone in the crowd.'

Attendees at the rally reportedly said they heard Secret Service agents say 'the shooter is down' after swarming the stage to come to the ex-president's side.

President Joe Biden sent out a statement at 7:53 p.m. saying he is 'praying' for former President Donald Trump and condemning 'this kind of violence' in the aftermath of Saturday's shooting at Trump's rally in Butler, Pennsylvania:

Sources tell the Associated Press that the shooting at Trump's Pennsylvania rally is an 'attempted assassination' of the former president

An emergency room doctor at Trump rally reveals how he performed CPR on a member of the crowd after the shooting.

'I heard the shots. I thought it was firecrackers begin with. Somebody over there was screaming he's been shot he's been shot,' said the man who had blood splattered all over his white USA shirt. 'So I made my way over. I said I'm an emergency department physician. Let me help you.'

'The guy has spun around was jammed between the benches and a head shot here. There's lots of blood and he had brain matter,' he told CBS News.

'So I got him together so I got people there really helpful. Certainly one of their CPR compressions as well.'

Former President George W. Bush and first lady Laura Bush sent out a statement through their spokesperson Freddy Ford condemning the assassination attempt on former President Donald Trump:

PA Senate Candidate Dave McCormick, who was standing in the front row of the rally:

Donald Trump wore a bulletproof vest on the campaign trail in 2016.

He started to take precautions after a man rushed the stage at one of his Ohio rallies.

It is unclear if he wears one now.

Ronald Reagan was the last president to face an assassination attempt before shots were fired at Donald Trump during a rally in Pennsylvania on Saturday.

When leaving the Hilton Hotel in Washington, D.C. on March 30, 1981, Reagan was shot at several times and wounded when one bullet ricocheted off a vehicle and struck him under the left armpit.

Then-President Reagan spent 12 days at George Washington University Hospital before returning to the White House.

Trump, while not currently the U.S. president, is the first to face an assassination attempt since that day in 1981.

The gunman is dead, according to law enforcement.The former president and this year’s presumed Republican presidential nominee was speaking at a rally in Pittsburgh, Pennsylvania on Saturday when several pops were heard before Trump grabbed his ear and ducked behind the podium.

Immediately before the shots, Trump was talking about immigration comparing his record to Joe BIden's.

'If you really want to see something this sad take a look at what happened,' he stated immediately before shots rang out in the crowd, hitting him in what appeared to be his right ear.

Marco Rubio, one of the favorites to be Trump's running mate, thanks God for protecting the former president.

Trump may no longer be president, but he is surrounded by a security cordon that assumes he remains at high risk.

There is no background screening for events where tens of thousands may attend.

But all rallygoers are screened at the entrances for weapons, projectiles or anything else that could cause a threat. Secret Service agents, often aided by local law enforcement agencies and even the TSA, operate airport-style magnetometers.

Pockets have to be emptied, hats removed. Bags are searched by hand.

Sniffer dogs nose through cases of media gear and journalists' laptop bags.

The list of prohibited items is long: From fireworks and firearms to coolers and e-cigarettes. Pretty much anything that could be blown up, thrown or used as a weapon.

Former Secret Service agent Jonathan Wackrow says:

This was supposed to be the start of Donald Trump's big week. After allowing Joe Biden the spotlight while he faced the biggest crisis of his political life, the rally in Pennsylvania was meant to mark the unofficial start of the Republican covention when he would officially become the party nominee.

That was all turned upside down in a split second on Saturday. The crowd flinch as the sound of a gunshot echoes through the fair ground. Trump puts his right hand to his head, and more shots can be heard.

Secret Service agents race on to the stage to protect the former president with their bodies.

Another volley of bullets can be heard, before a shout of 'Shooter down.' Then Trump stands, face bloodied, and raises his fist in the air before being hustled away.

A Trump insider told DailyMail.com: 'He's OK.'

Prayers are coming in for former President Trump after he was seen with blood on his face following shots that rang out at a Pennsylvania rally Saturday afternoon.

Rep. Dan Meuser, R-Pa., was standing front row at the rally along with Reps. Mike Kelly and GOP Senate candidate Dave McCormick.

Meuser said he heard between eight to 10 shots ring out, according to Fox News.

Witnesses said they heard someone shout 'Shooter down' as Trump was hustled from the stage by Secret Service agents.

A voley of shots could be heard during the attack.

Trump's motorcade has left the venue. His condition was not immediately known. Police began vacating the fairgrounds shortly after the former president left the stage.

President Joe Biden was leaving a church service in Delawae moments after the reports came in that Trump had been shot.

He said he had not yet been briefed on the shooting.

Donald Trump appeared to be shot in the ear as shots were fired at the former president at a rally in Pennsylvania.

Trump grabbed at the side of his face and blood spattered across his cheek as several popping sounds were heard.

The former president quickly pumped a fist at the crowd to show his supporters he was not severely injured, as Secret Service agents raced to the stage to race him away.

This is a developing story and will be updated as information is confirmed.