Angus Robertson has hit back at a Tory minister who said a second Scottish independence referendum should not be held until 2039 at the earliest.
House of Commons leader Mark Spencer said a gap of 25 years is required for any vote after the first was held back in 2014.
Scotland's Constitution Secretary blasted the Conservative MP saying he is in the "territory of democracy denial" if the UK Government doesn't allow a referendum to take place by the end of next year.
