In August 2019 Tester was one of 19 senators to sign a letter to United States Secretary of the Treasury Steve Mnuchin and United States Secretary of Health and Human Services Alex Azar requesting data from the Trump administration in order to help states and Congress understand the potential consequences of the Texas v. United States Affordable Care Act lawsuit, writing that an overhaul of the present health care system would form "an enormous hole in the pocketbooks of the people we serve as well as wreck state budgets".