The House Oversight Committee reached out directly to key figures in the Trump administration’s decision to add a citizenship question to the census, seeking interviews with the individuals, in letters that claimed the Commerce Department was stymieing the committee’s investigation.

The Commerce Department has not complied with a subpoena for certain documents, the committee Chairman Elijah Cummings (D-MD) and civil rights subcommittee Chairman Jamie Raskin (D-MD) said in the letters. Nor has the department cooperated with the committee’s request to interview the administration officials, according to the letters.

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