Week Four- Visit 3 - If their BP (> 120/60 mmHg), potassium (≤ 5.5 meq/dl) and renal function permit (Cr ≤ 1.5 mg/dl), they will be randomized to aliskiren (150 mg po, qd x 2 weeks) or placebo. If applicable, a urine pregnancy test will be done for child bearing age females.