The courts have yet to issue their final word on whether the Trump administration can add a citizenship question to the 2020 census.
But starting Thursday, the Census Bureau is asking about a quarter million households in the U.S. to fill out questionnaires that include the question, "Is this person a citizen of the United States?"
The forms are part of a last-minute, nine-week experiment the federal government is using to gauge how the public could react next year to census forms with the potential census question.
Around 480,000 households in most parts of the U.S., except Puerto Rico and remote Alaska, have been randomly selected to complete one of two versions of a test census form — one with the citizenship question, the other without.
The results, expected to be available this fall, will inform the bureau's upcoming advertising campaign for the 2020 census and plans for hiring door knockers to visit households that don't self-respond to the census. Test participants would still have to complete forms for next year's actual head count.
The bureau usually conducts similar field tests before making any changes to census forms. But Commerce Secretary Wilbur Ross, who oversees the Census Bureau, approved adding the question before the bureau could test it on a form with the planned 2020 census questions. The lack of testing was among the "smorgasbord" of administrative law violations a federal judge in New York cited in his ruling to block plans for the question.
"There is a great deal of evidence that even small changes in survey question order, wording, and instructions can have significant, and often unexpected, consequences for the rate, quality, and truthfulness of response," six former Census Bureau directors wrote in a 2018 letter expressing concern about the citizenship question.

