WASHINGTON —

The Supreme Court on Monday agreed to decide whether states can continue to count late-arriving mail ballots, which have been a target of President Donald Trump.

The justices took up an appeal from Mississippi after a panel of three judges nominated by the Republican president on the 5th U.S. Circuit Court of Appeals ruled last year that the state law allowing ballots that arrive shortly after Election Day to be counted violated federal law.

Mississippi is among 18 states and the District of Columbia that accept mailed ballots received after Election Day as long as the ballots are postmarked on or before that date, according to the National Conference of State Legislatures.

The list includes swing states such as Nevada and states such as Colorado, Oregon and Utah that rely

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