The list is overly broad in places and offers a reminder of why many Americans have lost faith in the Democratic Party on this issue. Democrats should make clear that they support the legitimate enforcement of immigration law. They should avoid the sweeping statements that some members of the party have used in recent years, including calls for sanctuary cities, the decriminalization of border crossings and the abolition of ICE. Recent polls show that Mr. Trump’s thuggish immigration policies are unpopular — but that more Americans still trust the Republican Party on immigration than the Democratic Party.