The US Supreme Court on Wednesday dealt setbacks to Republicans by allowing extended deadlines for receiving mail-in ballots in next Tuesday's election in Pennsylvania and North Carolina, states pivotal to President Donald Trump's re-election chances. The action by the justices means a Sept 17 ruling by Pennsylvania's top court allowing mail-in ballots that are postmarked by Election Day and received up to three days later to be counted will remain in place for now. The conservative-majority court on Wednesday also rejected a request by Trump's campaign to block North Carolina's extension of the deadline for receiving mail-in ballots, in another key battleground legal loss for Republicans. Trump has repeatedly attacked the integrity of mail-in voting.