Immigration activists rally outside the Supreme Court as the justices hear arguments over the Trump administration's plan to ask about citizenship on the 2020 census, in Washington, April 23, 2019.

U.S. Census Bureau plans to use a questionnaire with a citizenship question as part of its practice test for the 2030 census could jeopardize the once-a-decade head count and scare away immigrants ...

FILE - A briefcase of a census taker is seen as she knocks on the door of a residence, Aug. 11, 2020, in Winter Park, Fla. (AP Photo/John Raoux, File) FILE - A briefcase of a census taker is seen as ...