Lincoln and the secret service

[L Verge]

I have been told that, on the day he was shot, he authorized the creation of such a branch of service to assist the Treasury Department in tracking down counterfeiters. I don't believe that the Service took on the protective duties as we know them until the late-1800s or early-1900s.

Sorry for the incomplete answer. I used to know the details, but time and my brain marches on.