Mehmet Oz

The seat, which flips from Republican to Democrat, was vacated by retiring GOP Sen. Pat Toomey.

Winfrey brought on Oz as a regular guest on The Oprah Winfrey Show for more than five seasons in the early 2000s, giving him his big breakthrough.

Pennsylvania, Georgia, Nevada and Arizona come into focus in final days. Plus: where things stand in seven other Senate contests.

Lt. Gov. John Fetterman, a Democrat, and former TV doctor Mehmet Oz, a Republican, faced off last night in the only debate in a tight race that will help determine control of the Senate.

Midterm elections are next month. NPR's Steve Inskeep speaks with Republican strategist Scott Jennings about the Senate races in two key states: Pennsylvania and Nevada.

Recent events are giving Democrats hope of retaining the 50-50 Senate, which they narrowly control with the vice president casting tie-breaking votes.

Pennsylvania Democrat John Fetterman's expected return to the campaign trail comes as issues such as abortion rights and gun violence have taken on a new intensity.

Oz led McCormick by fewer than 1,000 votes as state officials conducted a recount after the May 17 primary.

The five statewide primaries once again tested former President Donald Trump's influence on the Republican side — with mixed results. Here's what we learned on Tuesday.

Five states hold primaries Tuesday. The top race is in Pennsylvania, where the GOP Senate primary will be another test of Trump's influence, while Democratic voters seem to favor John Fetterman.