Nicola Sturgeon has insisted the SNP has a "cast-iron" mandate to hold another independence vote, as she warned Boris Johnson has "no right to block the democratic wishes of the people of Scotland". Launching the party's General Election campaign at Dynamic Earth in Edinburgh, the First Minister also said that this election is an "opportunity to show Boris Johnson exactly what we think of such a contemptuous and disrespectful attitude towards Scottish democracy." Report by Czubalam. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn