The phrase "possible challenger" refers to someone or something that could potentially compete or oppose another person or thing in a situation or a specific task. Full definition
Other names mentioned as possible challengers include Comptroller Scott Stringer who has ramped up his public criticisms of the mayor and Republican Councilman Eric Ulrich. (dnainfo.com)
They didn't mind if things dragged out into early April, keeping the field of possible challengers in the September Democratic primary frozen. (nymag.com)
«I'm 74 - years - old, I may not be the best possible challenger to Andrew Cuomo,» Samuels told Fred Dicker on «Focus On The State Capitol.» (nystateofpolitics.com)