Early voting has been under way for weeks ahead of the midterm elections, when US voters will elect members of the House of Representatives and Senate and governors in states across the country.

More than 57 million people had already cast ballots as of Monday, with turnout surpassing the early vote four years ago in many closely watched states.

US is in the midst of a fresh test as Americans are set to turn out in millions for a midterm election, and the key facts about that election have been compiled.

US midterm voting began as Democrats seek to wrest control of Congress from Republicans, potentially challenging Trump’s legislative agenda.