CHICAGO (CBS) – A judge ruled Friday that the Affordable Care Act is unconstitutional.

In late 2017 lawmakers slightly altered Obamacare through a tax measure. A lawsuit was filed saying that was unconstitutional, and a Texas judge agreed.

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Health care for those covered through the ACA will not be dropped or changed tomorrow, but longer term could be a different story.

For now, provisions such as protections for people with pre-existing health conditions are technically invalid, leaving an estimated 20 million Americans’ health care coverage in limbo.

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President Donald Trump celebrated the decision, tweeting in part, “Obamacare has been struck down as an UNCONSTITUTIONAL disaster!”

The American Medical Association said in a release, “The AMA will work with patient and other stakeholder groups in pursuing an appeal and reversal of this unfortunate decision.”

CBS 2 legal analyst Irv Miller describes this as a legal bump in the road, perhaps on the way to another Supreme Court decision later.

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Years ago the high court ruled it was constitutional, but there are different justices there now, which could mean a different decision.