Final answer:
Amy Coney Barrett criticized the Obama administration for its healthcare policies, particularly the ACA or Obamacare, questioning its constitutionality before the Supreme Court ultimately upheld the law.
Step-by-step explanation:
Amy Coney Barrett criticized the Obama administration's healthcare policies, specifically the Patient Protection and Affordable Care Act (ACA), also known as Obamacare. Critics of the ACA, including Barrett, questioned its constitutionality and looked to the courts to overturn the law. However, the Supreme Court upheld the healthcare law, by a narrow 5-4 margin, as a constitutional extension of Congress's power to tax.