In a Feb. 3 letter to Treasury Secretary Jack Lew, Ryan, along with House Energy and Commerce Committee Chair Rep. Fred Upton, R-Mich., asked for “a full explanation for, and all documents relating to” the administration’s decision to make the cost-sharing payments without congressional authorization.

In response, on Wednesday, the Treasury Department sent a letter to Ryan largely describing the program, without offering a detailed explanation of the decision to make the payments. The letter revealed that $2.997 billion in such payments had been made in 2014, but didn’t elaborate on where the money came from. Over the next decade, cost-sharing payments to insurers are projected by the Congressional Budget Office to cost taxpayers nearly $150 billion.

Instead of detailing the basis for making the payments without appropriations, Treasury officials cited the ongoing House GOP litigation, and referred Ryan to the Department of Justice.