A 55-year-old Aboriginal man with a 10-year history of type 2 diabetes presents to your rural general practice for review. His blood pressure on three separate visits over the past month is around 152/94 mmHg. Urinary albumin:creatinine ratio is 6 mg/mmol and eGFR is 70 mL/min/1.73 m². He is not taking any antihypertensive medication. Which is the most appropriate first-line medication to start to reduce both his cardiovascular and renal risk?