Senate Republicans are asking the Health and Human Services Department to perform an actuarial analysis of the Senate health bill.

In a letter to the department today, Sens. Chuck Grassley (R-Iowa) and Mike Enzi (R-Wyo.), the ranking members of the Finance and HELP Committees, respectively, said more information is needed on the bill before a floor vote.

"The American public is understandably concerned about the prospect of Congress passing a two thousand page bill without the benefit of a complete assessment from those who best understand the actuarial impact of such decisions,” the senators wrote.

Republicans have so far sought to slow down debate on the bill. Requesting additional studies may be one tactic to do that.

The new request comes on the heels of a CBO report that found the Senate bill would increase individual premiums by 10% to 13%, but would lower premiums significantly for those eligible for federal subsidies.