WASHINGTON (AP) — A federal judge in Washington, D.C., has ordered the U.S. Postal Service to perform twice daily sweeps of processing centers in states with extended ballot receipt deadlines to check for mail-in votes and to expedite them for delivery.

Thursday's order will remain in place until the end of states' windows for accepting ballots.

According to court records, a similar order by the same judge earlier this week found just 13 ballots in a search of 27 processing hubs in several battleground areas.

Elections officials in key battleground states are continuing presidential vote counting. Democrat Joe Biden is urging patience, while President Donald Trump is pursing his legal options.

Several key states are too early to call — Pennsylvania, Georgia, North Carolina and Nevada.