A new sense of uncertainty has risen over Pennsylvania’s pivotal Senate contest.

The Republican nominee for U.S. Senate in Pennsylvania, Dr. Mehmet Oz, has released his health records as he maneuvers to keep questions about Democratic rival John Fetterman’s recovery from a stroke front and center.

The Democrats’ fragile hold on the Senate majority has become vividly apparent with the sudden illness of of New Mexico Sen. Ben Ray Luján.