The referendum is proposing a a limit of 10 million people until 2050 and has divided the country, being dubbed by some as a "Swiss Brexit".

The Swiss People's Party, with the most seats in Parliament, doesn't like immigrants and wants to limit the country to 10 million people.

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