Trump’s battle with sanctuary cities is the next phase of his confrontation with urban America

President Donald Trump’s threats to relocate undocumented immigrants and asylum seekers to “sanctuary cities” capture his determination to constantly press the boundaries of law and morality with hardline immigration policies. But it may reveal even more about his political posture toward the nation’s biggest population centers. …

Trump’s confrontational relationship with the largest cities extends his central political strategy of focusing almost entirely on energizing his political base even at the expense of heightening resistance from the voters outside of it. Demographically, that means tolerating intense antipathy from younger voters, minorities and many college-educated white voters in service of mobilizing older, evangelical and blue-collar whites. CONT.

Ronald Brownstein, CNN