RecruitingPhase 2Drug trialAtezolizumab + Sacituzumab Govitecan to Prevent Recurrence in TNBC (ASPRIA)The purpose of this study is to determine if a combination of two drugs sacituzumab govitecan and atezolizumab works as a treatment for residual cancer in the breast or lymph nodes and have circulating tumor DNA in the blood. This research study involves the following investigational drugs: * Sacituzumab govitecan * Atezolizumab