The bill is nearly identical to a proposal that passed the Senate in 2013 by a vote of 69-27. Sens. Lamar Alexander (R-TN), Heidi Heitkamp (D-ND), Roy Blunt (R-MO), Jack Reed (D-RI), Bob Corker (R-TN), Sheldon Whitehouse (D-RI) and Angus King (I-ME) joined Enzi and Durbin in sponsoring the bill.