Trump's probably only bluffing (a sort of tactic in making a difficult deal) about stripping Congress of the health care subsidies that were provided to them in the deal that was made by Obama in order to pass Obamacare.
Styx 666 likes Trump's threat to erase Obama's subsidies to Congress if it doesn't repeal the ACA as the Republicans ((including the weasel McCain) promised they would do.
Here's Styx's well put opinion (which will probably offend the thin skinned):