Republicans in Congress are reviving a controversial push to alter a key set of census numbers that are used to determine how presidents and members of the U.S. House of Representatives are elected.

Ratified after the Civil War, the 14th Amendment says the "whole number of persons in each state" must be included in what are called apportionment counts, the population numbers based on census results that determine each state's share of House seats and Electoral College votes for a decade.

But GOP lawmakers have now released three bills this year that would use the 2030 census to tally residents without U.S. citizenship, and then subtract some or all of them from the apportionment counts. Republicans on the House Appropriations Committee unveiled the latest bill Monday.

Any attempt to carry out the unprecedented exclusion of millions of noncitizens from the apportionment counts of the 2030 census is likely to undermine the head count's accuracy and face legal challenges, as the first Trump administration did in its failed push for similar changes for the 2020 census.