WASHINGTON (AP) — President Barack Obama's health care overhaul is front and center at the Supreme Court for three days of hearings to determine the fate of a law aimed at extending health insurance to more than 30 million Americans.

The justices will hear arguments beginning Monday in a highly partisan legal fight between the Obama administration and the 26 states that are leading a challenge to the largest expansion in the nation's social safety net in more than four decades.

A decision is expected by late June, in the midst of a presidential election campaign in which all of Obama's Republican challengers oppose the law and promise its repeal, if the high court doesn't strike it down first.

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