"Russia's borders are not secure. There is no reason to secure our other than to help unions artificially inflate wages."
Russia's borders are far more secure than ours.
And this is about preventing nukes from being exploded in our cities; it is NOT about 'bidnismin' making another nickel by importing cheap labor.
From a practical standpoint, it is impossible to smuggle nuclear material across the border, due the requirements for safely encasing it. To get it here, the terrorists would HAVE to use a shipping container.