Brown entered the fray over the region's future today with a speech in Scotland saying Brexit makes the case for Scottish independence weaker, not stronger.
Brown played an important role in 2014 when he helped convinced Scottish voters to stay in the UK.
Scotland First Minister Nicola Sturgeon seeks another independence referendum, but Prime Minister Theresa May has rejected holding another vote now.
Sturgeon seeks a vote in late 2018 or early 2019.
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