The future of Obamacare is at risk again. Here's what's at stake The future of the Affordable Care Act is once again in jeopardy. Though his time in the White House is limited, President Donald Trump now has a better chance of fulfilling his longstanding promise to kill the landmark health reform law, but in the courtroom instead of Congress. The Supreme Court is scheduled to hear oral arguments Tuesday in a case brought by a coalition of Republican state attorneys general and the Trump administration, who argue the law's individual mandate is unconstitutional, and the entire law must fall. Eyes on Barrett, Kavanaugh and Gorsuch as Supreme Court decides Obamacare's future If the court wipes away Obamacare, it would have a sweeping impact on the nation's health care system and on the lives of tens of millions of Americans -- not only for the roughly 20 million people who've gained coverage on the Affordable Care Act exchanges and through the expansion of Medicaid to low-income adults. The law is also what allows parents to keep their children on their health insurance plans until age 26 and obtain free mammograms, cholesterol checks and birth control. But one of its most popular provisions is its strong protections for those with pre-existing conditions, including barring insurers from denying coverage or charging higher premiums based on people's health histories. Nearly 54 million Americans -- or 27% of non-elderly adults -- have pre-existing conditions that would make them uninsurable in the individual market prior to the law, according to the Kaiser Family Foundation. "The implications of the court case could stretch far and wide," said Cynthia Cox, director of Kaiser's Program on the ACA. "Virtually every American has been affected in some way by the Affordable Care Act."