However, hasn't that been the case for many administrations and congresses before Trump took office?
I think a better indicator would be that the percentage of uninsured Americans
has risen since Trump took office despite his inability to really repeal the affordable health care act (mainly because of Republican resistance in Congress).
The health care problem in the US is due to much more than insurance availability though and one of the problems is that we always look at insurance, even though many health care plans actually are not insurance. If someone gets health "insurance" through their work, often it is just payment processing services that their employers are using. Insurance, strictly speaking, is something you are likely never going to use. Car insurance and house insurance for example are used for serious accidents and fires or storms (and sometimes those are even excluded from the policy). So the incentive for the insurance company is that the risk of a payout over a large number of policies is very low.
However, in most health care plans, the insurance provider doesn't actually pay out any of their own money but processes payment from employers to health care providers. There is no risk from the insurance side so it isn't really insurance. Instead, there is an increase in the number of people between the patients and the doctors determining their care. Imagine if you had to go through State Farm or Geico if you needed to fix a flat tire. Instead of costing $20 or less, it would cost $200 and you'd have to wait a month before you'd get into the garage.
That's what the doctors I know often complain about is that there are people with no medical experience using the bureaucracy of the plans to make critical medical decisions. What citizens need is significant medical advocacy that combines the collective interests of the actual health care providers and the people who use or will potentially need their services. However, the problem there naturally is that the health care companies spend a great deal to insure their advocates are in the political offices where these decisions are made.