Like it or not in Mr. Trump’s America, the Republicans will now be the anti-immigrant party and the Democrats the pro-immigrant party, confidently associated with America’s multiculturalism.

Few of those who worry that Mr. Trump’s exploitation of race and immigration will carry the day in 2020 noticed that his party badly lost an off-year election that Mr. Trump centered on immigration. Democrats won the House popular vote by more than eight percentage points. Republicans gained Senate seats mainly in deep Red states where, generally speaking, Republicans ran well behind Mr. Trump’s performance two years earlier.

This year, Mr. Trump extended his war on immigrants and immigration. Yet the percentage of Americans who say that immigrants strengthen the country and are not a burden has risen from 54 percent after the 2018 election to 65 percent now. This view is held strongly by 52 percent. Only 26 percent agree with the president that immigrants are a burden because they are accused of taking jobs, housing and health care.

American voters will not disappoint us again.