An internal memo proposes carving out $40 billion from federal health agencies while eliminating dozens of programs. Congress has ultimate appropriation authority.

The Trump administration is formulating plans to cut roughly a third of the federal health budget, eliminate dozens of programs and vastly whittle down health agencies, according to an internal document reviewed by CNN.

A draft budget proposal circulating among federal officials would dramatically deepen cuts at the nation's top health agency, eliminating some public health programs entirely and serving as a roadmap for more mass firings.