So, just by changing back the definition of what constitutes full time employment, President Trump can essentially eradicate, as in destroy, the employer mandate portion of ObamaCare --and there's not much Congress can do about it.
Trump can alter the Employer Mandate in ObamaCare by Executive Order
Unlike Republican members of Congress, Trump can use his pen to fundamentally transform ObamaCare.
The Affordable Health Care for America Act (ObamaCare) forces businesses to provide health insurance largely via the employer mandate.
The Obama regime had the IRS define a full time employee as follows: