The biggest issue with this bill is the assumption that sanctuary cities will take this measure lightly. Los Angeles, Seattle, and New York are just three cities out of the hundreds that have imposed measures which could define them as sanctuary cities. They also happen to be major centers of commerce, high-population areas, and areas in which many companies have headquartered themselves. These cuts will not punish illegal immigrants, or even the cities' mayors and governed officials, which I assume is the desire of those legislators on the pro side.
All they will do is strengthen the cities' resolve, make the immigration debate even more personal and toxic, and breed distrust for the national government. The new term has begun, and a lot of Americans fear federal overreach like this--especially in high population areas where grants, categorical and block alike, can be essential to education, safety, and infrastructure. The majority of people this bill will impact are legal citizens--many of whom don't support illegal immigration themselves but will be greatly disheartened by legislators misguidedly and carelessly inflicting damage on them and their families.