Control of both congressional chambers by Democrats would enable them to stall President Donald Trump's legislative agenda, launch investigations, and exercise leverage over spending and executive branch oversight

Policy, personnel, and politics of the Trump White House.

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 that determine control of Congress and shape the political direction of the country.