The phrase "net immigration" means the difference between the number of people entering a country and the number of people leaving the country. Full definition
Otherwise, there is nobody arguing against the need to reduce net immigration. (conservativehome.blogs.com)
It merely speaks of lowering the rate of net immigration to the united states. (politics.stackexchange.com)
I'd still stick with a baseline year for per - capita allocations, don't adjust for population growth / decline, do adjust for net immigration. (rabett.blogspot.ru)