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Election workers continue the process of counting ballots for the Pennsylvania primary election, on May 18, at the Mercer County Elections Board in Mercer, Pa.Keith Srakocic/The Associated Press

Pennsylvania’s Republican primary for an open U.S. Senate seat is too close to call and is likely headed for a statewide recount to decide the winner of the contest between heart surgeon-turned-TV celebrity Dr. Mehmet Oz and former hedge fund CEO David McCormick.

A recount would mean that the outcome of the race might not be known until June 8, the deadline for counties to report their results to the state.

Dr. Oz, who was endorsed by former president Donald Trump, led Mr. McCormick by 1,079 votes, or 0.08 percentage points, out of 1,340,248 ballots counted as of 5 p.m. Friday. The race is close enough to trigger Pennsylvania’s automatic recount law, with the separation between the candidates inside the law’s 0.5 per cent margin. The Associated Press will not declare a winner in the race until the likely recount is complete.

Both campaigns have hired Washington-based lawyers to lead their recount efforts, and both have hired Philadelphia-based campaign strategists who helped lead the operation to observe vote-counting on Election Day for Donald Trump’s presidential campaign in 2020.

The two campaigns already had dozens of lawyers and volunteers fanned out around the presidential battleground state as election workers and election boards toiled through the remaining ballots.

Pennsylvania Republican Senate candidates David McCormick, left, and Mehmet Oz during campaign appearances in Pennsylvania.The Associated Press

The big field of Republican candidates and their super PACs reported spending more than US$70-million during the primary campaign. The winner will face Democratic Lieutenant-Governor John Fetterman in November in what Democrats see as their best opportunity to pick up a seat in the closely divided Senate.

Mr. Fetterman won the Democratic nomination while in the hospital recovering from a stroke four days before the election. The incumbent, Republican Senator Pat Toomey, is retiring after serving two terms.

Mr. Trump’s clout is again on the line, as he looked for a third straight win in Republican Senate primaries after Hillbilly Elegy author J.D. Vance prevailed in Ohio earlier this month and U.S. Representative Ted Budd easily scored a victory in North Carolina on Tuesday.

County election boards began meeting Friday to sort out problematic or provisional ballots, even as election workers processed the last of the mail-in ballots and election-day ballot tallies from precincts.

The state’s 67 counties have until Tuesday’s deadline in state law to certify their results to the state. Then the state’s top election official has until next Thursday to issue a recount order, which is mandatory – unless the losing candidates asks in writing that it not be carried out.

Counties have until three weeks after the election – June 7 – to finish the recount and another day to report results to the state.

The initial result could change: A recount of a statewide judicial race last November ended up padding the winner’s margin by more than 5,500 votes in a race where more than two million ballots were cast.

Before that, there could be a flurry of lawsuits contesting the decisions of certain counties on whether to count ballots that may be difficult to read or bear some kind of irregularity.

As of yet, neither campaign has gone to court, and both candidates have expressed confidence in victory.

Dr. Oz and Mr. McCormick dominated the seven-person GOP field, blanketing the state’s TV screens with political ads for months and spending millions of their own money, before conservative activist Kathy Barnette surged in the campaign’s final days.

The fiery, hard-line pro-Trump alternative blistered both Dr. Oz and Mr. McCormick as “globalists,” pro-Trump pretenders, carpetbaggers and too wealthy to help regular people.

Dr. Oz, who is best known as the host of daytime TV’s The Dr. Oz Show, had to overcome misgivings among hardline Trump backers about his conservative credentials. Rivals also charged that his dual citizenship with Turkey would compromise his loyalties to the United States. If elected, Dr. Oz would be the country’s first Muslim senator.

Mr. McCormick was virtually unknown four months ago and emphasized his credentials as a hometown success story.

He not only had to overcome Mr. Trump’s endorsement of Dr. Oz, but Mr. Trump also attacked Mr. McCormick viciously and repeatedly in the final two weeks of the race, calling him a Wall Street liberal, a sellout to China and the candidate of “special interests and globalists and the Washington establishment.”

Mr. McCormick got help from a super PAC supporting him that spent US$20-million, giving him a massive cash advantage, much of it from Wall Street figures that paid for TV ads to attack Dr. Oz.

Both men reported assets of more than US$100-million and moved from out of state to run – Dr. Oz from a mansion in Cliffside Park, N.J., above the Hudson River overlooking Manhattan, and Mr. McCormick from Connecticut’s ritzy Gold Coast.

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