The immigration bill I voted for in the Senate started the United States down the road to a much better immigration system. But it's not finished. In its broad outlines, I support the comprehensive approach that the Senate bill takes. History has taught us that immigration reform measures cannot work in isolation. Simply strengthening physical border security or beginning a guest worker program will not fix the deep, underlying problems in America's immigration system. Any bill Congress sends to the president must enhance border security, create an operational temporary worker program, provide for work-site enforcement, and address the status of...