David Frost, the government’s new chief Europe adviser, and other EU official said on Monday that Britain would only agree to a deal without what he refers to as the “undemocratic backstop”. Mr. Frost reiterated Prime Minister Borris Johnson’s stance that the backstop element of Theresa May’s plan – which aims to prevent a hard border returning between Ireland and Northern Ireland – had to be abolished. He also said Mr. Johnson’s new ministers were not bound by commitments made by the previous government.