Government lawyers said the act became invalid when the previous Republican-led Congress axed parts of it.

Democratic challenger Joe Biden attacked the move, saying Mr Trump had put millions of lives at risk during the coronavirus pandemic.

Health care will be a key battleground in the November presidential election.

Some 20 million Americans could lose their health coverage if the court overturns the Affordable Care Act (ACA), which was introduced by Donald Trump's Democratic predecessor, Barack Obama.

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