Scottish First Minister Nicola Sturgeon has said a second referendum on Scottish independence before 2020 is "highly likely".
Speaking on ITV's Peston on Sunday, Ms Sturgeon said events since Britain voted to leave the EU has made her even more resolved to push through another referendum.
The First Minister said she is "absolutely serious" about exploring other options, but insisted that the prime minister must show Scotland's interests within the UK can be protected.
"If Scotland really is an equal partner in the UK [and] Theresa May is serious about protecting the UK, then it's time for her to turn those words into action and actually demonstrate that Scotland's voice is heard," Ms Sturgeon said.
The first minister also attacked Theresa's May for not sharing her position on negotiating Britain's exit from the EU, saying her approach is "unsustainable and unacceptable".