A 54-year-old man with type 2 diabetes mellitus, hypertension, and established cardiovascular disease is reviewed. His HbA1c is 8.1%, eGFR is 65 mL/min/1.73 m??, BMI is 31 kg/m??, and he has a history of heart failure (NYHA class II). Which is the most appropriate addition to his regimen to provide both cardiovascular and renal benefit?