Ms Sturgeon told Sky Newsy: “I’m saying if Boris Johnson wants to stop it, he would have to take legal action.
“If Boris Johnson didn’t do that [take legal action to dispute the legal basis of the referendum], by definition it would be a legal referendum.
“If he did do that, the courts would decide.”
Under a ‘Road to Referendum’ blueprint published by the SNP Scottish Government in back in January, Ms Sturgeon outlined her party’s intention pass a referendum bill once the coronavirus pandemic is over, and then demand Mr Johnson agree to a Section 30 order that will pave the way for a second referendum.
If Mr Johnson refuses, Ms Sturgeon is expected to press on regardless.