What are the similarities and differences in the ACA between the Obama administration and the beginning of the Trump administration?

Read Case Study 2 in Chapter 1 of your textbook (attached case study 2). Search for research articles and other resources on the Affordable Care Act (ACA) during the Obama administration and search for research articles and other resources on ACA during the Trump administration.
Answer the following:
What are the similarities and differences in the ACA between the Obama administration and the beginning of the Trump administration?
Why is healthcare reform so challenging in the history of the United States?
In addition to the presidency and Congress, what are the other determinants for successful healthcare reform?
Why does the ACA continue to be controversial despite widespread opinion in favor?
Answer in paragraph format per question. You must include your references.
There is no word minimum or maximum for this assignment, 4-5 sentence answer per question should suffice.
Textbook reference from which the case study is from is
Shi. (2019). Introduction to Health Policy. Second edition. Chicago, IL: Health Administration Press, HAP.

QUICK QUOTE

Approximately 250 words