The DuPage County Sheriff's Office joined the U.S. Secret Service, Illinois State Police and Illinois National Guard in a sweeping security operation Sunday, Sept. 27, as President Donald Trump attended the Presidents Cup final round at Medinah Country Club.

The operation included sanitation trucks blocking intersections, unmanned aerial drones, military helicopters and TSA-style screening checkpoints for spectators, ABC7 Chicago reported. The Federal Aviation Administration (FAA) issued a temporary ground stop for departures at O'Hare International Airport, citing "VIP" as the reason.

Outside the gates, several hundred protesters and Trump supporters gathered on opposite sides of the street. The two groups clashed before police stepped in and separated them.

Derek Mayer, Secret Service Chicago special agent in charge, told NBC Chicago on Sunday that agencies had been preparing for years. "The PGA Tour and DuPage County take security seriously," Mayer said. "We're expecting 30,000 people a day and when the president's here there will be a multi-layer approach to our security."

Illinois National Guard Blackhawk helicopters staged in Schaumburg ahead of the visit, according to an ABC7 I-Team report.

The Sheriff's Office deployed unmanned aerial drones daily throughout the tournament week, The Center Square reported.

Spectators faced TSA-style screening around the first-tee grandstand. Anyone who left the secure area had to be re-screened before re-entering. The Secret Service blocked spectators from crossing the first fairway except during brief windows when Trump stepped inside a suite.

The DuPage County Board had approved an intergovernmental police assistance agreement on Aug. 25 authorizing cooperation between the Sheriff's Office and surrounding municipalities for the event. The county's Office of Homeland Security and Emergency Management provided interoperable communications support, and staff coordinated encryption keys and radio access with Illinois State Police.

Outside the club, protester Allison Galvan told ABC7 she blamed the administration's tariffs for rising household costs. On the other side, Jeff Castle, DuPage County Republican Party secretary, said his business was thriving.

Trump spoke briefly at the first tee after PGA Tour CEO Brian Rolapp introduced him. He told the crowd: "Our country is doing great, better than ever before."

The visit was Trump's first trip to the Chicago area since 2019. ABC7 reported officials expected more than 150,000 total visitors over the four-day tournament, which ran Sept. 24 through Sept. 27.