The 61-year-old Oz has begun hiring a staff and reaching out to potential allies, according to influential Republicans familiar with his plans. It is unclear when he is planning an official announcement.

The Cleveland-born, Delaware-raised, and New Jersey-based Oz rose to national attention as a guest on the Oprah Winfrey Show, where she dubbed him “America’s doctor,” and later as the host of his own program. A political newcomer who has donated to both Democrats and Republicans, Oz’s principal connection to Pennsylvania appears to be his graduate education at the University of Pennsylvania, where he earned both medical and business degrees in the 1980s. He owns a mansion—and is registered to vote—in neighboring New Jersey and bought a vacation home in Palm Beach, Fla., in 2015, according to public records. He does not own property in Pennsylvania, at least under his own name…

“Tuesday was a really good night, needless to say,” said a Pennsylvania-based Republican strategist, referring to the party’s strong performance in last week’s off-year elections, “but Republicans can mess this up really quickly if we’re putting candidates on the stage whose backgrounds are going to be fodder for October and November campaign ads. Let’s not confuse Tuesday night with a coronation in the Senate.”

Critics are likely to home in not only on Oz’s flimsy ties to the Keystone State but also on the quack solutions—miracle cures for everything from fat loss (raspberry ketones, green coffee beans) to longevity (red palm oil)—that he has hawked to an enormous audience amidst serious and sensible medical advice.