 The Congressional Budget Office estimates S. 2590 will cost $15 million over its authorized time period of 2007–2011.The bill was introduced by Senator Tom Coburn, for himself and Senators Barack Obama, Tom Carper and John McCain on April 6, 2006.After two "secret holds" placed by Senators Ted Stevens, a Republican, and Robert Byrd, a Democrat were revealed and removed, it was passed unanimously in the Senate on September 7, 2006 and by the House on September 13, 2006.