Republicans currently hold a 53-47 Senate majority ahead of the November 3 midterms, but forecasts show Democrats favored to flip control amid voter reaction to the administration’s Iran policy. The US-Iran memorandum reopening the Strait of Hormuz, signed in June after months of conflict and naval blockade, ended immediate hostilities and stabilized energy flows, though earlier disruptions contributed to higher oil prices and inflation concerns. Senate votes on war powers resolutions exposed GOP divisions, while polling in battlegrounds such as Ohio, Maine, Texas, Iowa, and Kansas reflects the impact of these developments on turnout and swing-state margins. Any final resolution of outstanding nuclear and sanctions issues within the agreement’s framework could still influence late campaign dynamics before voters decide chamber control.