How does the Secret Service "protect" the president?
In order to maintain a safe environment for the president and other protectees, the Secret Service calls upon other federal, state and local agencies to assist on a daily basis. The Secret Service Uniformed Division, the Metropolitan Police Department, and the U.S. Park Police patrol the streets and parks nearby the White House. The Secret Service regularly consults with experts from other agencies in utilizing the most advanced security techniques. The military supports the Secret Service through the use of Explosive Ordnance Disposal teams and communications resources. When the president travels, an advance team of Secret Service agents works with the host city, state and local law enforcement, as well as public safety officials, to jointly implement the necessary security measures.
The United States Secret Service, one of the nation's oldest federal investigative law enforcement agencies, was founded in 1865 as a branch of the U.S. Treasury Department.
www.secretservice.gov
In reading the above the US SS works WITH other agencies, they don't hand protection over to the other agencies. DJT was the "target", and another few inches and DJT would likely not be alive.
Sadly, because the former president wasn't protected by the US SS (Their PRIMARY job) DJT and others were injured or killed.
The US SS leadership of coordinating WITH other agencies failed.
jmo