Christopher Wilson of the Woodrow Wilson Center, left, addresses a question concerning the root causes of immigration from the members of the Congressional Border Caucus during an Ad Hoc hearing on immigration held at the Board of Supervisors Hearing Room, 2150 N Congress Dr. in Nogales, AZ. Others in the photo are Jennifer Allen of the League of Conservation Voters, center, and Allison Moore, director of legislative and regulatory affairs with the Fresh Produce Association. Photo taken Friday, September 13, 2013. 

Ron Medvescek / Arizona Daily Star