AS president, Donald Trump has vowed to block federal funding to so-called “sanctuary cities” that defy federal immigration law. While we don't agree with all of Trump's stances regarding immigration, this is a sensible proposal.

Federal law requires city and county governments to cooperate with the federal Department of Homeland Security's Immigration and Customs Enforcement Agency (ICE). Sanctuary cities are generally defined as those that don't comply with that law. In essence, authorities in those communities have a “don't ask, don't tell” policy when interacting with illegal immigrants, even in situations involving arrests for serious crimes. Ultimately, local officials choose to release those individuals on personal reconnaissance or bail, and don't notify federal immigration authorities.

Such policies are often adopted based on arguments stressing compassion for those here illegally. That compassion is understandable, but a ripple effect of sanctuary policies can be increased lawlessness and crime. Local residents — legal and otherwise — pay the price in reduced public safety and increased taxpayer burden. Communities that are openly identified as “sanctuary cities” draw a disproportionate share of the worst of the worst — drug cartel members and others whose crimes go well beyond lacking legal immigration papers — because these people know the chance of deportation is much lower in such communities.

In California's Santa Clara County, illegal immigrants who had been arrested were released on probation or bail even when those individuals had a history of committing serious or violent crimes. In 2012, that county's district attorney, Jeff Rosen, urged officials to change the policy, saying it had led to the release of six felony sex offenders or child molesters, eight residential burglars, 10 gang members and 12 drunken drivers who had either injured a victim or were repeat offenders. Thirty of those individuals fled the jurisdiction upon their release.