Obamacare is not perfect.
Monolithic insurance companies control the market.
Their executives aberrantly raise the costs of medicine and hospital care.
Donald Trump excoriated the health system by stating with vehemence, "Obamacare is a total disaster and I promised to replace the ACA with the finest health-care plan there is."
Trump failed to elaborate on his scheme, but it's probably a combination of the GOP's traditional policy on health ie "Drop dead." and Trump's propensity for declaring bankruptcy.
It's his forte.
Although Captain Picard of the Enterprise has a question for Trump.
Also take note that Americans are illing more and more from bad food, compromised water, and polluted air.
More of the GOP's Drop Dead philosophy.