What Happens If the Affordable Care Act Is Struck Down?

While Trump has thus far failed to fulfill his campaign promise of repealing and replacing former President Barack Obama’s signature health care plan, he appeared to get a second wind last week. The Justice Department sided with a federal judge in Texas, who ruled in December that the law’s individual mandate was unconstitutional and that the rest of the law was therefore invalid—despite the Supreme Court previously upholding the law in 2012.

The Texas ruling calls into question...