After nearly a decade since the Affordable Care Act was signed into law, the U.S. is poised to find out what Obamacare will look like without its linchpin requirement for people to buy health insurance.

The sweeping tax reform bill that passed late last year included a repeal of the requirements that everyone has health insurance, starting in 2019. Obamacare allies, independent estimates, and Democrats say the move by President Trump and congressional Republicans will raise premiums and cause the program’s insurance exchanges to crumble.