Countries such as Greece that have problems monitoring their borders could be excluded from the 25-nation Schengen zone in Europe, which allows passport-free travel in the area.
Under draft legislation unveiled by the European Commission Friday, border controls could be reintroduced to deal with unexpected flows of immigrants or if a member of the Schengen area fails to police its border with non-European Union countries.
Greece has already received help from the Union?s border monitoring agency, Frontex, after a sharp increase in the number of illegal immigrants reaching its borders from Turkey.
France, Germany and Spain have already opposed the draft as they believe it gives Brussels too much power. They argue that the right to restore border controls should rest with national governments.