Fetterman spoke to supporters at Montgomery County Community College.
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Abortion rights was the main focus of the event.
As the general election grows closer, Dr. Mehmet Oz, a celebrity heart surgeon and political novice, has begun stepping up his questioning of Fetterman's fitness for office after he suffered the stroke in May.
SEE ALSO: John Fetterman says he will debate Dr. Mehmet Oz this fall
Pennsylvania Senate race: John Fetterman says he will debate Dr. Mehmet Oz this fall
Fetterman's team has insisted he is fit for office.
"I truly hope for each and every one of you, you didn't have a doctor in your life making fun of it, making light of it or telling you you're not fit to serve," said Fetterman.
Dr. Oz spent Saturday also rallying, using the time to key in on Fetterman who he believes is unwilling to debate.
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"He hasn't agreed to a debate. To agree to a debate, you actually have to give a date," said Oz.
Fetterman did publicly announce he will participate in one debate in October, although no date has been finalized.
Fetterman, the state's lieutenant governor, and Oz are vying to replace retiring Republican Sen. Pat Toomey in a race Democrats see as one of their best chances nationally to flip a Republican-held seat. The winner in the battleground state could help decide the chamber's partisan control next year.
SEE ALSO: Pa. Senate race: Dr. Mehmet Oz calls on John Fetterman for televised debate
Pa. Senate race: Dr. Mehmet Oz calls on John Fetterman for televised debate
The Associated Press contributed to this report.