President Trump on Thursday abandoned his quest to place a question about citizenship on the 2020 census, and instructed the government to compile citizenship data from existing federal records instead, ending a bitterly fought legal battle that turned the nonpartisan census into an object of political warfare.

Mr. Trump announced in the Rose Garden that he was giving up on modifying the census two weeks after the Supreme Court rebuked his administration over its effort to do so. Just last week, Mr. Trump had insisted that his administration “must” pursue that goal.

“We are not backing down on our effort to determine the citizenship status of the United States population,” Mr. Trump said. But rather than carry on the fight over the census, he said he was issuing an executive order instructing federal departments and agencies to provide the Census Bureau with citizenship data from their “vast” databases immediately.

Even that order appears to merely reiterate plans the Commerce Department announced last year, making it less a new policy than a means of covering Mr. Trump’s retreat from the composition of the 2020 census form.

This is definitely a cave by Trump, though he is trying to cast it as another stalwart attempt to promulgate his war against minorities.