Can Democrats stop the Iran war and reverse Trump’s tariffs after their midterm win?

Democrats took control of both the House of Representatives and the Senate in the November 3, 2026, midterm elections, dealing a major defeat to Donald Trump’s Republicans. Their majorities will strengthen congressional scrutiny of the president and allow lawmakers to block legislation, though Trump retains powers he can use without congressional approval. Trump began the war on Iran with Israel in February without congressional authorisation and could still order attacks. Democrats could constrain his military options by withholding additional funding when the current government-funding bill expires on December 11.