Boris Johnson cannot deny an IndyRef2 if the SNP win a majority of seats at Holyrood at next year's election, Ian Blackford has warned.The Nationalist MP hit back at the Prime Minister after he used a flying to visit to the north of Scotland to once again rule out the prospect of another referendum on independence.Blackford claimed Johnson would be a "democracy denier" if he refused to engage with SNP demands.The Prime Minister insists the issue of independence was settled at the 2014 referendum