Secret Service agents can be heard saying, “Shooter’s down” as they ushered former President Trump off the stage at a rally in Butler, Pennsylvania.

Former President Donald Trump was rushed off stage during a disturbance at a rally in Butler, Pennsylvania, on Saturday.

Photos show the moments before, during and after the shooting at Donald Trump's rally in Pennsylvania.

Law enforcement officials held a press conference after deadly gunfire erupted at a Trump campaign rally in Butler, Pennsylvania.

ABC’s Whit Johnson spoke to Josh Drespling about what he experienced at the rally in Butler, Pennsylvania.

Presidential historian Mark Updegrove spoke to ABC’s Whit Johnson about past shootings targeting political figures.

ABC’s Rachel Scott was at the rally in Butler, Pennsylvania, when a shooter opened fire.

President Joe Biden, in remarks, called the shooting at Donald Trump's Pennsylvania rally "sick" and said he hopes to talk to Trump soon.

ABC’s Whit Johnson spoke to Nathan Rybner about what he experienced at the rally in Butler, Pennsylvania.

John Dohanich spoke to ABC’s Whit Johnson about what he witnessed at a Trump rally in Butler, Pennsylvania.

Former President Donald Trump still plans to attend the Republican National Committee convention in Milwaukee, according to a joint statement from the Trump campaign and the RNC.

A number of spectators spoke to ABC News about what they experienced at the rally in Butler, Pennsylvania.

ABC News Senior Investigative Correspondent Aaron Katersky offers the latest about the shooting at a rally in Butler, Pennsylvania.

ABC’s Whit Johnson spoke to Rico Elmore, a speaker at the rally in Butler, Pennsylvania.

ABC News Senior Investigative Correspondent Aaron Katersky offers the latest about the shooting at a rally in Butler, Pennsylvania.

Two spectators at the rally in Butler, Pennsylvania, spoke to ABC’s Rachel Scott about initially mistaking gunfire for firecrackers.

The former president posted on social media about injuries he sustained at a rally in Butler, Pennsylvania.

Stephen Lasko, who was at the rally in Butler, Pennsylvania, describes the location of the shooter as being on a “warehouse.”

Butler County District Attorney Richard A. Goldinger spoke to ABC News.

Officials say the Trump rally incident in Pennsylvania is being investigated as a possible assassination attempt. ABC News' Aaron Katersky reports.

Officials are investigating the incident as a possible assassination attempt. ABC News' Rachel Scott reports.

Leonard Verdetto was at the rally in Butler, Pennsylvania, where possible shots were heard.

One bystander is “confirmed dead,” and “possibly a second” bystander is dead as well, Butler County District Attorney Richard A. Goldinger told ABC News.

Senior Congressional Correspondent Rachel Scott discusses what happened at the rally in Butler, Pennsylvania, before she was escorted out by Secret Service.

Trump began his speech at about 6 p.m. and was only shortly into his speech when a disturbance caused Secret Service to swarm the former president.

The Secret Service rushed former President Donald Trump off stage at a Pennsylvania rally.

Facebook has lifted restrictions imposed on Donald Trump after the Jan. 6 attack on the Capitol

Days after former President Trump sought to distance himself from the controversial Project 2025 plan, former Trump adviser Stephen Miller is following suit.

After Donald Trump this week challenged President Biden to a golf match, Biden's former golf instructor told ABC News that he likes Biden's chances.

Donald Trump is expected to announce his running mate in the coming days, with the focus zeroing in on Sens. Marco Rubio, J.D. Vance and North Dakota Gov. Doug Burgum.

Former President Donald Trump's campaign is tapping a host of pop culture allies to tout their support at the Republican National Convention in Milwaukee next week.

President Trump has made it official GOP policy to build an Iron Dome missile shield for the US. The military says it's not something it needs.

Former President Trump has asked a judge to throw out his criminal hush money conviction, based on the Supreme Court's recent presidential immunity ruling.

ABC News Washington Bureau Chief and Political Director Rick Klein breaks down a new ABC News/Washington Post/Ipsos poll.

Michael Cohen asked the U.S. Supreme Court on Wednesday to revive his lawsuit accusing former President Donald Trump and of retaliating against him.

J.D. Vance jumped on the national stage eight years ago through his book "Hillbilly Elegy." Now he's a top contender to be picked as Donald Trump's running mate.

When Florida Sen. Marco Rubio was first elected to Congress, he was seen as a rising star in the GOP. Now, he’s being looked at as a possible VP Pick for Donald Trump.

Doug Burgum has come a long way since his failed presidential bid. Now, he's one of the top candidates under consideration for being Donald Trump's running mate.

With Donald Trump expected to soon make his vice presidential pick known, he offered more insight into characteristics he likes of each candidate on his shortlist.

Presumptive GOP nominee Donald Trump is back on the campaign trail rallying support and dropping hints on a possible running mate.

At his first campaign rally in 10 days, former President Donald Trump jumped on the uncertainty of President Joe Biden's campaign.

Donald Trump wants to distance himself from Project 2025, a conservative plan to overhaul the government -- but it's led by many of his former administration officials.

At his first campaign rally in 10 days, former President Donald Trump jumped on the uncertainty of President Joe Biden's campaign.

J.D. Vance could now reach new heights in his transformative career, possibly serving as former President Donald Trump's vice president.

House Democrats on Tuesday held a press conference reinforcing their support of President Joe Biden as the Democratic nominee and addressing the dangers of a potential Trump presidency.

After Joe Biden's disastrous debate, Democrats worried about the president's chances in November are mired in a debate of their own: shut up or shout louder.

Different from 2016, it will show a party in lockstep with the former president.

As Donald Trump gets closer to announcing his vice presidential pick, many of his top candidates have a long history of attacking him personally and politically.

Nikki Haley continues to win some votes against Donald Trump in the Republican primary, despite the former president clinching the party's nomination on March 12

DeSantis and Haley see opportunity in New Hampshire and South Carolina to, somehow, cut into Trump's huge lead in popularity in the Republican primary