RecruitingDrug trialRoginolisib (IOA-244) With Venetoclax and Rituximab for Refractory/Relapsed Chronic Lymphocytic Leukemia (CLL)This research study will test the safety and anticancer activity of the combination of three drugs (Roginolisib, Venetoclax, and Rituximab) for participants with relapsed or refractory Chronic Lymphocytic Leukemia (CLL). The names of the study drugs involved in this study are: * Roginolisib (a novel type of PI3-kinase delta inhibitor) * Venetoclax (a type of B-cell lymphoma 2 inhibitor) * Rituximab (a type of monoclonal antibody)