Cook Political Report's shifting of House seats toward Democrats is driven by President Donald Trump's low polling numbers and growing public disapproval of the Iran war

The armed conflict between the United States and Iran and the political fight it set off at home, from strikes and the naval blockade around the Strait of Hormuz to negotiations over Iran's nuclear program. Debated through war powers, munitions stocks and household costs.

Bicameral federal legislature of the United States, made up of the Senate and the House of Representatives, which writes law, controls federal spending and oversees the executive branch. Its two chambers represent states and districts on different terms and hold different constitutional powers.

Federal and state elections held midway through a presidential term, deciding control of Congress and many governorships. Turnout falls well below presidential years and the president's party usually loses ground, which makes them a standing referendum on the sitting administration.