Switzerland heads to the polls on Sunday to decide on a proposal that could make it the first European country to impose a formal limit on its population. The referendum asks voters whether the country’s population should be capped at 10 million by 2050, a measure that has triggered a fierce debate over immigration, economic growth and Switzerland’s future relationship with the European Union.

Right-wing SVP proposal would limit Switzerland to 10 million residents by 2050, forcing major immigration curbs and threatening EU free-movement deals

The anti-immigration measure comes amid cost and crime concerns