Republicans currently hold a 53-47 Senate majority ahead of the November 3, 2026 midterms, defending 22 seats while Democrats defend 13, with Democrats needing a net gain of four seats for control. Key battlegrounds include Republican-held seats in Maine, North Carolina, Ohio, Alaska, and Texas alongside Democratic seats in Georgia and Michigan. The conditional market ties Senate outcomes to progress on the U.S.-Iran memorandum of understanding and related Iran-Oman talks on Strait of Hormuz navigation routes, mine clearance, and commercial shipping arrangements signed earlier in 2026. Recent developments include ongoing route mapping and joint statements emphasizing coastal state sovereignty, though full reopening, blockade lifting, and final administration details remain unresolved with deadlines approaching in late October. These geopolitical and energy market factors could shape voter views on foreign policy and economic conditions in the final weeks.