London (CNN) The Brexit process was thrown into disarray Monday as Prime Minister Theresa May pulled the plug on a crucial parliamentary vote on her deal for the country to leave the European Union. May admitted that "there remains widespread and deep concern" over the Northern Ireland backstop. The backstop is an arrangement designed to ensure there is no return to a "hard border" between Ireland, which will remain part of the European Union after Brexit, and Northern Ireland when the UK leaves the bloc next March. The prime minister said she had hoped changes secured to the backstop, to avoid being trapped in it indefinitely, would be enough for MPs. May is due to attend a meeting of European leaders on Saturday.

Source: CNN December 10, 2018 13:18 UTC