The study drug obinutuzumab will be given as an IV infusion (through a vein in your arm). The second study drug, venetoclax, will be take by mouth at home. Study visits will include blood draws, bone marrow biopsies and/or aspirations and stool samples. We will also do CT scans or MRIs of your chest, pelvis, abdomen, and any other areas of your body that your study doctor thinks are appropriate so that we can look at and measure your disease.