Fix the problem of People who are on Medicare with a supplement being denied coverage for pre=existing conditions.

The insurance companies who insure Medicare supplement plans have under their underwriting guidelines that was drawn up by Congress and the insurance companies have the right to deny you coverage for pre-existing conditions it you decide to switch insurance companies to get a cheaper premium. By Congress and the insurance companies agreeing on this policy in the Underwriting guidelines people on Medicare are restricted to keeping the same insurance for life or the policy being discontinued.
Call the Congress and President and have this problem fixed so seniors cannot be discriminated against. The ACA eliminated this problem, but has no effect on Medicare.