Watch live: President Biden speaks Sunday on Trump rally shooting, assassination attempt

President Joe Biden is scheduled to address the media at 1:30 p.m. ET Sunday following the shooting and assassination attempt on former President Donald Trump at a rally in Butler, Pennsylvania on Saturday that left one dead and 3 injured, including Trump.

The Federal Bureau of Investigation identified the gunman as Thomas Matthew Crooks, 20. Crooks was killed at the scene and an investigation into Crook's motive is ongoing.

Biden called the attack "sick" in an emergency press conference in Delaware Saturday and called his Republican opponent Saturday night. "The idea – the idea – that there’s political violence, or violence in America like this, is just unheard of, it’s just not appropriate. Everybody, every must condemn it," Biden said.

USA TODAY will carry Biden's address here and on our YouTube channel here.

Latest news

Here are some of the latest developments:

∎ House Speaker Mike Johnson said on the TODAY show Sunday said that we have to "turn the temperature down" in this country and promised that Congress will do a full investigation of the incident “to determine where there were lapses in security and anything else that the American people need to know.”

∎ Two patients who attended Trump's rally are being treated at Allegheny General Hospital in Pittsburgh and remain in critical condition Sunday, Nikki Buccina, a spokesperson for the Allegheny Health Network confirmed.

∎ The gunman's father, Matthew Crooks, told CNN Saturday evening that he was trying to figure out “what the hell is going on” and would “wait until I talk to law enforcement” before sharing details about his son.

∎ The gunman had explosive devices in his car, the Wall Street Journal reported. Police received multiple reports of suspicious packages near where the shooter was, officials said, according to the report.