What we need to do first is to find out how big the...

What we need to do first is to find out how big the migration problem is and what the economic consequences of it are for the United States and Mexico. We hear a lot of extravagant numbers and claims made, but very few hard facts. We don't really know what, if any, burdens illegal migrants impose on the US economy or the social welfare apparatus, and those issues must be clarified.