NICOLA Sturgeon is set for a Brexit showdown with Theresa May today as David Mundell signalled he would resign if the Prime Minister tied UK fishing to EU rules beyond the December 2020 transition period. . https://www.heraldscotland.com/news/17234377.nicola-sturgeon-poised-for-downing-st-showdown-with-theresa-may-as-brexit-tensions-rise/