David McCormick, who has been declared the winner of the race by the Associated Press, attended new member orientation just this past week.

The ruling is a major victory for Republican Senate candidate David McCormick, who holds a very narrow lead over Democratic Sen. Bob Casey ahead of a statewide recount.

Pennsylvania's state Supreme Court on Monday weighed in on a flashpoint amid ongoing vote counting in the U.S. Senate election between Democratic Sen. Bob Casey and Republican David McCormick, ordering counties not to count mail-in ballots that lack a correct handwritten date on the return envelope.