Dominic Raab, U.K. exiting the European Union (EU) secretary, left and Michel Barnier, chief negotiator for the European Union (EU), shake hands following a news conference in Brussels, Belgium, on Friday, Aug. 31, 2018. Barnier said it was critical and urgent to come to a resolution to the conundrum of how to avoid a hard border in Northern Ireland. Photographer: Jasper Juinen/Bloomberg via Getty Images