Trump is scheduled to speak at the Prairie du Chien Area Arts Center on Saturday afternoon. However, the campaign had originally planned to hold the event outdoors before the Secret Service raised concerns about its ability to secure the event due to staffing shortages, according to a senior official briefed on the planning who was not authorized to speak publicly .

“The agency was never designed to provide such a high level of protection to a growing number of protected individuals,” the intelligence official told the Journal Sentinel. “Our personnel and equipment are being pushed to the limit to maintain the current operational tempo.”

The official noted that the visit to Wisconsin came at the same time as world leaders gathered in New York for the United Nations General Assembly summit. The agency is responsible for securing the event.