The public focus of Congress’ Jan. 6 investigation, so far, is what happened in Washington, D.C. Behind the scenes, the probe’s state-level work is kicking into overdrive.

The House committee investigating the Capitol attack has gathered thousands of records from state officials and interviewed a slate of witnesses as it attempts to retrace former President Donald Trump's attempts to subvert the 2020 election, particularly in four key states that swung the presidency to Joe Biden. They're getting ready to take their work public, possibly as soon as the spring.

“We want to let the public see and hear from those individuals who conducted elections in those states,” select panel chair Rep. Bennie Thompson (D-Miss.) said in an interview. He described those witnesses as particularly important given their mandates to keep elections “fair and impartial” while hailing from one political party. The voluminous documents state election officials have sent the Jan. 6 committee, obtained by POLITICO through open records requests, underscore the depth of Trump's pressure campaign directed at the typically lower-level administrators of presidential balloting. The emails, texts and phone recordings also add consequential context to previously reported incidents, such as Trump’s call to Georgia's top elections investigator and Mark Meadows’ outreach to Georgia election officials.