According to Pennsylvania's public court records, Crooks had no criminal history, and officials said they are still working to identify a motive for the shooting.
The meme read: "Y'all gun-toting, 2nd Amendment-loving hillbillies better just sit down and stay quiet unless you're gonna change your mind on gun control."
The attempt on the former president's life has generated a wide array of claims, some of them extreme, highlighting the unsettling uncertainties surrounding the attack.
Several witnesses reported that they had alerted law enforcement about a gunman crawling on the building, but no action was taken before he began shooting.
One attendee of the rally lost their life in the tragic shooting, while two others, all male according to law enforcement, remain in critical condition after being wounded.
Seeing Crooks pointing the gun at him, the officer retreated down the ladder, and Crooks quickly aimed and fired around eight shots at the former president.
The U.S. Secret Service is investigating how a gunman with an AR-style rifle was able to get so close and injure former President Donald Trump at a rally in Pennsylvania.
U.S. media reports that at the age of 17, he donated $15 to the liberal ActBlue political action committee on January 20, 2021, Biden's Inauguration Day.