Robbie Gibb has worked as the Director of Communications at No 10 Downing Street from July 2017 to July 2019 so he has overseen the period during which his boss, Theresa made a complete mess of her attempt at resolving our departure from the EU. The red lines he refers to in this tweet are not ones that belong to the EU but rather the ones that belong to Theresa and her colleagues. However backstops are something very different. The reason for the backstops is to address the issue indicated in the lower image which is from the Vote Leave website. People like Robbie and his Brother Nick and indeed a number of others who voted to Leave did so to close our borders. It is the closure of the borders that leads to the backstop and it is naïve to suggest otherwise.