Polling stations are beginning to close in the US mid-term elections, which will determine who runs Congress and shape President Donald Trump's agenda.
Democrats have been battling to win control of the two legislative chambers, where Mr Trump's Republican party currently holds sway.
Governor posts and seats in state legislatures are also up for grabs.
Mr Trump is not up for re-election until 2020, but this poll is widely seen as a referendum on his presidency.
Polling stations are closing in eastern US states.
All 50 states and Washington DC have been voting, and experts say turnout could be the highest for mid-term elections in 50 years.
The president kept up a stream of Twitter endorsements for Republican candidates throughout Tuesday, urging his supporters to get the vote out.
Barack Obama - on the campaign trail for the Democratic party on Monday - stressed the same, saying "the character of our country is on the ballot".
