Supreme Court grapples with theory that would upend federal election rules

The Supreme Court on Wednesday weighed a blockbuster redistricting case from North Carolina involving whether state legislatures have near exclusive power to set federal election rules with no review by state courts, a dispute that brought stern warnings of the disruptions such an idea could cause to elections nationwide and the unchecked power it could give to state lawmakers.

Known as Moore v. Harper, the case stems from the redrawing of the congressional map by North Carolina's GOP-led legislature in the wake of the 2020 Census, which was struck down by the...