The Guardian's Andrew Roth analyses how Democrats, newly in control of both houses of Congress after the 2026 midterms but unable to override vetoes, will likely use budget leverage to constrain Donald Trump's war in Iran and tariffs, which his analysis and JD Vance blame for the Republicans' "generational wipeout". Trump retains veto power over Iran, tariff and Ukraine policy, Roth writes that he may resume strikes on Iran now the midterms have passed, and Ryan Crocker warns Democrats must not overplay their hand.