Republican delegates have begun gathering in Milwaukee for the 2024 Republican National Convention (RNC), where former President Donald Trump is set to be nominated for president. Following an assassination attempt on Trump at a campaign rally in Butler, Pennsylvania, security concerns have heightened, leading President Biden to order a review of the convention's security plan.

The assassination attempt occurred on Saturday when a shooter opened fire at the campaign rally, resulting in one fatality and two injuries. Secret Service agents swiftly responded and neutralized the shooter, preventing further harm. Despite the incident, organizers of the largest planned protest against the RNC have stated that it will proceed as scheduled.

The Coalition to March on the RNC, anticipating no counterprotests related to the assassination attempt, expects over 5,000 people to participate in the rally on the convention's opening day. The group believes that Trump's contentious rhetoric has contributed to an increase in hate and is determined to voice their opposition. Furthermore, they credit the recent decline in President Biden's polling numbers and performance as a boost for their march's attendance.

On today's schedule, two official sessions are planned, along with screenings of the upcoming film "Reagan" starring Dennis Quaid as the 40th president. Various events tailored for state delegations are also scheduled. NPR will provide live analysis and coverage throughout the convention, including major announcements and speeches.

In response to the assassination attempt, the Trump campaign is adjusting its messaging for the convention. Rather than focusing on attacking President Biden, former President Trump aims to emphasize unity in his speech, according to a source familiar with the campaign's plans. President Biden, who has called for a reduction in political rhetoric's intensity, has ordered a review of the RNC's security plan.

During interviews with newspapers on Monday, Trump revealed that he believes he narrowly escaped the assassination attempt by instinctively turning his head. Trump is also expected to announce his pick for vice president during the convention, ending months of speculation. FOX News' Brett Baier reported that the announcement will take place tonight.

Milwaukee, which is hosting the RNC four years after the predominantly virtual Democratic National Convention, has benefited from its previous preparations for the DNC in 2020. City officials have stated that Milwaukee is now "turnkey" ready for the RNC. Mayor Cavalier Johnson, a Democrat, supported the RNC's arrival due to the potential economic benefits, with VISIT Milwaukee estimating $200 million in spending as a result of the convention.

Moreover, Wisconsin's status as a swing state in presidential elections has made it an attractive choice for both Democrats and Republicans aiming to secure victory in November. In the 2020 presidential election, Biden won Wisconsin by a slim margin of around 20,000 votes. Now, both parties are working diligently to increase their support in the state.

As the 2024 RNC officially begins in Milwaukee, delegates, protesters, and security forces are bracing for a convention filled with political speeches, announcements, and demonstrations amidst the backdrop of heightened security concerns brought about by the recent assassination attempt on Donald Trump.