Its evidence lists the practical problems to recovering the cost of treating diseases, and says a proposal to refund the money to the Welsh government instead of specific parts of the NHS "creates further complexity".
As soon as next week, every senator will get a chance to vote on a proposal to help strengthen school safety and help people struggling with mental health problems get the treatment that they need.
"This extreme proposal is a blueprint for future supply problems, " Urvan Sternfels, president of the National Petrochemical and Refiners Association, told reporters.