President Trump undoubtedly stands on strong political ground, backed by most Americans, in cases where he's deporting convicted criminals. • Now comes a new test, literally 40 years in the making: How comfortable are Americans with deporting millions of immigrants who paid taxes, built families and committed no crimes after coming here illegally?

Why it matters: That's the heart of the standoff in LA, as well as the broader Trump effort to expel potentially millions of immigrants who broke the law to get here and then played by U.S. rules. • "I said it from Day 1: If you're in the country illegally, you're not off the table," Tom Homan, Trump's border czar, told the N.Y. Times. "So, we're opening that aperture up."

The backstory: Congress, going back to 1986, has sought and failed t

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