This development reported by Democratic lawyer Marc Elias is in line with my theory that PA is one of the two states to watch in terms of pre- and post-election litigation by the Trump campaign.

Here’s how the Philly Inquirer described the holding of the Pa Supreme Court that will apparently be challenged at the U.S. Supreme Court:

State law says mail ballots must be received by 8 p.m. on Election Day, but the high court said Thursday that ballots will be counted if they are received by 5 p.m. the Friday after the Nov. 3 election. To count, ballots arriving after Election Day must either be postmarked by Nov. 3 or have no proof they were sent afterward. Ballots that arrive by the new deadline with missing or illegible postmarks would still be counted.

I haven’t been able to find the filing yet to see what federal question might be raised in this petition.