The British government says that the talks to leave the European Union will start Monday, as planned.
A day after France and Germany both said Britain could reverse Brexit if it wanted, Verhofstadt said Britain's budget rebates and opt outs from EU rules would disappear if it did so.
European Union leaders meeting next week will agree to boost cooperation in the areas of security and defense and express support for global trade and the Paris agreement.
Questions were also raised about the wisdom of including the DUP in any government of the United Kingdom.
The vote to elect the lower house's 577 members comes a month after Macron defied the odds to win the presidency of the eurozone's second-largest economy.