Pennsylvania Republican Senate candidate Dave McCormick filed two lawsuits challenging provisional ballots in Philadelphia, signaling he is prepared to take his fight to the Supreme Court.

McCormick declared victory after The Associated Press projected Thursday that he beat Sen. Bob Casey (D-Pa.) in the key race. Decision Desk HQ, The Hill’s partner, has not yet called the race.

McCormick’s lawyers said Philadelphia plans to adjudicate between 15,000 and 20,000 provisional ballots and that his campaign intends to challenge “large groups” of them for not complying with statutory requirements.

The Republican asked for court permission to challenge batches of ballots collectively rather than fighting each one individually, citing a need for efficiency. McCormick also asked that election officials only be allowed to........

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