A wall will not deal with the root of the problem which is a broken immigration law with 1. quotas that do not reflect the need for workers- from Highest skill- to low skill. As long as there are vacant jobs not being filled with Americans folks will break the law to fill them. 2, Does nothing for the 30-50% of illegals who are visa overstays and 3. Would require a much larger and more expensive force to monitor it.