Short Answer 
Former U.S. presidents receive lifelong protection from the Secret Service, with the number of assigned agents varying based on individual threats and political contexts. The specific details regarding the number of agents remain classified for security reasons.
Lifelong Protection
Former presidents of the United States are granted lifelong protection by the Secret Service. This is a security measure to ensure their safety following their time in office. This protection continues even after their presidency ends, reflecting the risks associated with their former roles.
Variable Agent Assignment
The number of Secret Service agents assigned to protect an ex-president is not fixed; it varies based on individual circumstances. Factors influencing the number of agents include the specific threats faced and the current political climate. The more significant the perceived threat, the greater the number of agents assigned to their security detail.
Classified Information
It is crucial to understand that the exact number of agents assigned to any ex-president’s protection detail is classified. This means that the information is not publicly disclosed for security reasons. By keeping this information secret, the Secret Service aims to maintain the effectiveness of the protective measures in place.