Brussels bigwig Michel Barnier has warned Emmanuel Macron is driving France to the brink of its very own Frexit moment.Barnier, who also claimed the EU will not renegotiate Brexit without free movement, issued the warning as voters prepare to elect members to France’s legislature.Macron called the snap poll after National Rally stormed to victory in the EU Parliamentary Elections earlier this month.The populist party, led by Marine Le Pen and Jo…