The first results are expected to be announced late this evening, around 10pm Irish time
Americans are heading to the polls today in crucial midterm elections which could reshape the balance of power in Washington.
Republicans currently control both chambers of Congress, but Democrats are hoping to overturn those majorities.
Polls suggest Democrats could take control of the House of Representatives, while the outcome of the Senate contest remains uncertain.
Hours before the polls opened, US strikes on an Iranian island have been carried out.
Officials say they were "in self-defence" - but come at a time when US President Donald Trump is trying to keep control of Congress.
The first of the polls have opened, with polling stations in Vermont the first to welcome voters, with the soaring cost of living seen as the main concern.
The first results are expected to be announced late this evening, around 10pm Irish time.
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