General Discussion

Vice presidents typically do not have Secret Service protection after their term of service is up, unless some threat or danger exists. If the vice president runs for the office of president, however, he or she — and all other major candidates in the primary and general presidential election — are likely to receive protection. Just how soon this is provided may be based in part on the profile of the candidate and any possible early threats, which are not that uncommon, to a candidate’s life.

https://www.americaexplained.org/who-receives-secret-service-protection.htm