More than three weeks after the website was launched, the administration has declined to provide information about enrollments so far.
"We have received numerous reports from Hoosiers who have been unable to enroll due to website malfunctions as well as complaints from Hoosiers who can no longer afford the new premium amounts," they wrote. "As we work to assist these constituents, it is important that we are able to provide them accurate data regarding the health insurance exchange."
The letter specifically asks for the number of applicants so far in the state of Indiana, and the number of applicants per congressional district.
Sebelius will testify next week before the House Energy and Commerce Committee in a hearing that will explore the botched rollout of ObamaCare.
The letter originated with Rep. Jackie Walorski, and was signed by Sen. Dan CoatsDan CoatsSouth Korea missile defense online in ‘coming days’ Sanders on skipping WH Korea briefing: 'I did not want to be part of a photo op' Overnight Defense: Senators go to White House for North Korea briefing | Admiral takes 'hit' for aircraft carrier mixup | Lawmakers urged to beef up US missile defense MORE and Reps. Susan BrooksSusan BrooksOvernight Cybersecurity: Nunes recuses himself amid ethics probe | Surveillance uproar puts GOP in a bind | Dem bill would reinstate internet privacy rules Ethics panel opens investigation into Nunes Women2Women Agenda proving the political system is not broken MORE, Larry BucshonLarry BucshonThe Hill's Whip List: 36 GOP no votes on ObamaCare repeal plan A guide to the committees: House Republicans who oppose, support Trump refugee order MORE, Luke Messer, Todd Rokita, Marlin Stutzman and Todd YoungTodd YoungRinging the alarm in Congress: 20 million lives at risk due to famine Picking 2018 candidates pits McConnell vs. GOP groups Senators introduce new Iran sanctions MORE.
Earlier in the day, Sen. Lamar Alexander (R-Tenn.) said he would propose legislation that would require weekly reports on ObamaCare enrollment numbers.