From an important essay at Brussels Journal, From Citizen to Subject:The Rule of Experts and the Rise of Trans-National Anti-Democrats:
One of the most serious challenges to democracy in the 21st century is the unprecedented pressure from migration, and the fact that certain groups can decide to permanently change the entire demographic make-up of a country without public debate and without public consent, by simply refraining from upholding its borders. It has been called “the greatest demographic experiment ever forced onto a people politically.”