The Pittsburgh Post-Gazette’s editorial board wrote that Pennsylvania Republican U.S. Senate nominee Mehmet Oz has raised “legitimate concerns” about his Democrat opponent, Lt. Gov. John Fetterman, in an editorial published Tuesday.

The Hill reports:

The editorial comes a week after Fetterman announced that he would not participate in a debate with Oz during the first week of September, citing his recovery from a stroke he had in May and statements from Oz’s campaign that Fetterman has said mocked him for having the stroke.

“If Mr. Fetterman is not well enough to debate his opponent, that raises serious concerns about his ability to serve as a United States senator,” the editorial states.

Fetterman told the Post-Gazette in July that he felt “really good” following the stroke and has no “physical limits.”

The editorial states Fetterman’s campaign has acknowledged lingering struggles with speech but asserts that he will fully recover and is taking the necessary steps to do so in speech therapy. It states that a live debate is the best way to determine if Fetterman is up to the job of senator.

Oz has the backing of 45th President Donald Trump, which helped the notable television doctor to clench the GOP nomination to go up against Fetterman in November.