(CNN) Democratic lawmakers believe they have uncovered another example of previously-hidden political calculus driving the Trump administration's decision to include a question about citizenship on the 2020 Census.

But with the Supreme Court poised to rule on the question's validity this week, it remains unclear whether the latest string of revelations will have any bearing on whether the question is asked .

James Uthmeier, a former top adviser to Commerce Secretary Wilbur Ross , told the House Oversight Committee in closed-door interview that he had "sought advice" from John Baker, someone the committee Democrats say has "argued that 'the citizenship question is necessary to collect the data for a redistricting of House seats that excludes aliens from the calculation.'"

Baker is now the third voice in the administration's ear arguing that the question is critical for changing the way congressional districts are drawn -- from a count of the entire population to a count of only those eligible to vote.

Ross, however, has maintained that he added the question to assist the Justice Department in enforcing the Voting Rights Act -- an idea he and his aides planted in the department's thought process.

Read More