Trump’s new plan to hijack the census will imperil America’s future

If Donald Trump winds up as a one-term president—which current polling suggests will be the case—he seems determined to go out with a final blow in his war against the nation’s changing demography. This time, he has set his sights on the Census Bureau, as it struggles to overcome the challenges of the COVID-19 pandemic and complete its once-in-a-decade headcount that is vital to our democracy.

Two weeks ago, the Trump administration issued a memorandum seeking to remove undocumented immigrants (“illegal aliens” in the memo’s words) from the census headcount...