Pete Williams for NBC News:

Republicans in the presidential battleground state of North Carolina asked the Supreme Court on Thursday to block lower court rulings that allowed six extra days to accept ballots sent by mail.

The Trump campaign, the state and national Republican parties and Republican leaders of the state Legislature said decisions by North Carolina’s Board of Elections, upheld by federal courts, “pose an immediate threat to the integrity of the federal elections process.”

The board changed the mail ballot deadline from Nov. 6, which the Legislature set in June, to Nov. 12. A federal district judge refused to block the change, and so did the 4th U.S. Circuit Court of Appeals.