President Obama, employing his strongest language to date on the Supreme Court review of the federal health care overhaul, cautioned the court Monday against overturning the law — while repeatedly saying he’s “confident” it will be upheld.

The president spoke at length about the case at a joint press conference with the leaders of Mexico and Canada. The president, adopting what he described as the language of conservatives who fret about judicial activism, questioned how an “unelected group of people” could overturn a law approved by Congress.

“I’m confident that the Supreme Court will not take what would be an unprecedented, extraordinary step of overturning a law that was passed by a strong majority of a democratically elected Congress,” Obama said.

The Supreme Court spent three days hearing arguments last week in four separate challenges to the health care law, which stands as the president’s signature domestic policy accomplishment. A central challenge was over the individual mandate — the requirement that Americans buy health insurance. Critics say the mandate is unconstitutional, and that the federal government cannot force people into the insurance marketplace.

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