What exactly do you mean by net zero immigration? Fact is more people enter US than they leave.
Srikar V

He may have been referring to Mexico->US migration. It has actually been negative since 2008. This would probably mean that a border wall would be either complete useless or decrease the number of Mexicans returning from the US.

One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.