CHICAGO (CBS)– The U.S. Supreme Court will hear arguments, Tuesday, about the future of the Affordable Care Act, known as Obamacare.

Many Chicagoans may be impacted by the decision.

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Depending on the outcome of the case, more than 23 million people could lose their health insurance. But while the hearing begins Tuesday, a decision isn’t expected for months.

The Trump administration and Republicans have been trying to get rid of the 10-year-old health care law for years now. Eight years ago, the Supreme Court’s ruling left important parts of the law intact.

But, the court is now controlled six-to-three by a conservative majority.

Protections for people with pre-existing conditions and coverage of young adults up to age 26, under their parents’ insurance policies, are all at stake.

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Tuesday also marks the first time Justice Amy Coney-Barrett will be on the bench since she was sworn in.

President-elect Joe Biden plans to deliver a speech on the Affordable Care Act Tuesday as the high court hears arguments on its merits.

A decision isn’t likely until spring of next year.

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