“Crimmigration reflects, on one hand, an increase in the number of crimes that can result in deportation, and on the other, a push among immigration opponents to create ever more crimes for which to prosecute immigrants. For example, entering the country without inspection is already a crime, but the recent Republican immigration bill, the Securing America’s Future Act, would have made it a federal crime to be in the United States without a valid immigration status, thereby criminalizing the estimated 11 million undocumented immigrants in the country.”