It's a first real stumble for the new leader of the Wildrose Party.
Brian Jean has apologized after suggesting Prentice worked behind the scenes to try and undermine Prime Minister Stephen Harper during his years as in Ottawa.
Both Jean and Prentice were caucus colleagues in the Harper government.
Jean told media Wednesday, Prentice was entangled in disloyal backroom dealing in a bid to undermine Harper when the Prime Minister was vulnerable due to low poll numbers.
He claimed Prentice worked against Harper because he secretly wanted the top job himself.
Prentice sounded genuinely upset by the allegation, calling it ridiculous and said he has hada very good relationship with Harper over the years.
Jean has released this statement:
"It was inappropriate of me to talk about past internal caucus tensions. I owe my former colleagues an apology. I won't be speaking further on this topic - it is a distraction from the important issues facing Albertans in this election."
Jean declined The Rebel's efforts to interview him on camera today.
It's unclear whether this stumble will hurt Jean politically given recent polls that suggest the Wildrose Party is leading the pack in the early going.