From Marshall Fitz and Philip E. Wolgin and the Center for American Progress:
One of the most common refrains voiced by opponents of immigration reform is that it must wait until the federal government has secured our border with Mexico and enforced the nation’s current immigration laws. Ten years ago those claims carried some force. At the time, there had been large-scale undocumented migration for a sustained period, the border was relatively porous, and immigration enforcement in the country was less organized than it could have been. Ten years later, however, the facts on the ground have changed dramatically.