Will Trump stay on the ballot? What to expect at the Supreme Court Thursday.

The Supreme Court on Thursday will confront the critical question of Donald Trump’s eligibility to return to the White House, hearing arguments in an unprecedented case that gives the justices a central role in charting the course of a presidential election for the first time in nearly a quarter-century.

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The justices will decide whether Colorado’s top court was correct to apply a post-Civil War provision of the Constitution to order Trump off the ballot after concluding his actions around the Jan. 6, 2021,...