Common Cause et al., are challenging President Trump’s attempt to exclude undocumented immigrants from the state-population totals that are produced by the 2020 Census and used for apportioning seats in the U.S. House of Representatives and votes in the Electoral College. This case is pending in the U.S. District Court for the District of Columbia.
https://www.brennancenter.org/our-work/court-cases/common-cause-v-trump