When will we know the US midterms results?47 minutes agoDeirdre FinnertyandBernd Debusmann Jr
BBC A designed image of a young woman taking notes on a notepad over a purple background with red and blue bars. She wears a denim jacket with a pin that reads "I voted"BBC

Millions of Americans are voting in midterm elections. The outcome determines which party - US President Donald Trump's Republicans or opposition Democrats - controls Congress and could have a significant impact on Trump's presidency.

Once polls close, it is possible the results will not be projected for several hours, days or even weeks. Here's what you need to know.

When will we know the results and who controls Congress?