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 CoatsBipartisan gun measure survives test vote Senate panel advances nominee who Democrats blasted on Social Security Lobbying World MORE and Reps. Susan BrooksSusan BrooksOvernight Healthcare: Republicans to get Thursday briefing on ObamaCare replacement plan House approves bill to launch opioids task force Overnight Healthcare: House takes first step on opioids bills MORE, Larry BucshonLarry BucshonGOP slams Obama administration response on Medicare proposal Overnight Healthcare: Medicare fight looms on Capitol Hill Medicare battle brewing on Capitol Hill MORE, Luke Messer, Todd Rokita, Marlin Stutzman and Todd YoungTodd YoungDems pressure vulnerable Republicans on Trump meetings Young beats Stutzman in Indiana Senate GOP primary Ind. Senate candidate paid relative 0K for campaign work MORE.
Earlier in the day, Sen. Lamar Alexander (R-Tenn.) said he would propose legislation that would require weekly reports on ObamaCare enrollment numbers.