The group met outside the union building in the city's Spring Garden section on Thursday wearing shirts that read "Local 22 members not in support of Donald Trump."
Local 22 broke from the national organization, IAFF, which previously endorsed Joe Biden.
READ MORE: Controversy erupts over Trump endorsement by Philly firefighters, paramedics union
Many of these firefighters and EMTs say the union's executive board should have put the endorsement to a vote.
Jeremiah Laster, a 30-year member and paramedic told Action News last week, "I think it was a very unwise and foolish move by the union. Only 554 people, according to their survey results, actually voted. That is not an overwhelming endorsement."
The union has not responded to Action News' request for comment.