Trump Jr. says father is 'changed man'

The U.S. Secret Service in recent weeks had increased Donald Trump's security detail due to intelligence indicating there was an Iranian threat to assassinate the former president, according to three officials familiar with the matter.

There is no indication the plot was related to the assassination attempt against the former president on Saturday.

The sources have suggested Iran has been making these types of threats since the assassination of Iranian military officer Qasem Soleimani in January 2020.

READ MORE | Trump Secret Service protection had been increased due to Iran threat

Trump's campaign announced that he and JD Vance will be holding a rally in Grand Rapids, Michigan, on Saturday.

This will mark their first rally together and the first one after Trump's assassination attempt. The rally will take place in an indoor venue and the first since the assassination attempt on Saturday.

The Department of Homeland Security and the FBI have issued a bulletin to law enforcement across the country warning them that, in the wake of Saturday's attempted assassination of former President Donald Trump, violent extremists could try to conduct "follow-on or retaliatory" attacks at events over the next few months related to the 2024 presidential election.

The bulletin urged local, state and federal law enforcement -- and their partners -- to remain vigilant and report any suspicious behavior.

"The FBI and DHS remain concerned ... particularly given that individuals in some online communities have threatened, encouraged, or referenced acts of violence in response to the attempted assassination," said the bulletin, issued Monday night as the Republican National Convention got underway in Milwaukee to officially nominate Trump as the Republican Party's candidate for the White House in November.

One of the men injured in Saturday's shooting, 57-year-old David Dutch, was shot in the chest and liver, according to the Marine Corps League of Pennsylvania.

Dutch is no longer in a medically induced coma and has been upgraded from critical to stable condition, the organization said.

Dutch is a former Marine who serves as commandant of his Marine Corps League detachment, the organization said.

The other injured victim, 74-year-old James Copenhaver, has also been upgraded from critical to stable condition, officials said.