MSPs at Holyrood voted to pass the First Minister's motion calling for a second referendum.
But the Prime Minister has said the UK government will not approve a second vote on Scotland's membership of the UK, at least until the country has left the EU.
People supporting Scottish independence have gathered outside the Parliament in Edinburgh.
Today, MSPs will vote on whether a second independence referendum should be held.
MSPs voted 69 to 59 to mandate the First Minister to seek permission from the UK Government for a ballot to be held.
Nicola Sturgeon has been speaking, as the Scottish Parliament votes on whether to push forward with a second referendum.