Washington, June 30 -- The US Supreme Court has ruled that states may continue counting postal ballots received after Election Day, provided they were postmarked by the day of the election, rejecting a challenge backed by the Trump administration by a narrow margin.

In a 5-4 decision, the court upheld a Mississippi law allowing mail-in ballots postmarked on or before Election Day to be counted if they arrive within five days afterwards, reports BBC.

The ruling represents a significant setback for President Donald Trump and Republicans, who argued that federal law requires ballots to be both cast and received by Election Day.

Trump, a long-time critic of mail-in voting, described the judgment as a "tremendous loss" and renewed calls for t...