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 CoatsSenate Intel head in the dark about Trump intelligence review DNI confirmation hearing expected on Senate return Intelligence business: Trump must keep privacy protections for US firms MORE and Reps. Susan BrooksSusan BrooksA voice for GOP women in DC GOP recruitment goal: More women on ticket Overnight Tech: Trump meets Alibaba founder | Uber to make some data public | GOP Lawmakers tapped for key tech panels MORE, Larry BucshonLarry BucshonRepublicans who oppose, support Trump refugee order Overnight Tech: Trump meets Alibaba founder | Uber to make some data public | GOP Lawmakers tapped for key tech panels CBO: Bill to block controversial Medicare change would cost 5M MORE, Luke Messer, Todd Rokita, Marlin Stutzman and Todd YoungTodd YoungOvernight Cybersecurity: Senate takes a hard line on Russia | Dems want hearings on Trump's cyber issues GOP lawmakers urge Trump to get tough on Russia Senators to Trump: We support additional 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.