The Supreme Court will decide whether the 2020 census can include a question about citizenship that could affect the allocation of seats in the House of Representatives and the distribution of billions of dollars in federal money.
The justices have agreed to a speedy review of a lower court ruling that has so far blocked the Trump administration from adding the citizenship question to the census for the first time since 1950.
Both the administration and opponents of the question agreed the court should settle the matter quickly because census forms need to be printed soon.
Arguments will take place in late April. A decision should come by late June.