Former presidential hopeful Mike Huckabee will campaign with presumptive Republican nominee John McCain for the first time since withdrawing from the primary race in March, GOP sources told FOX News on Thursday.

Huckabee will join McCain in Arkansas next week, Republican sources say, where the two are set to attend a fundraiser in Little Rock. McCain's campaign has not yet confirmed the meeting.

Rumors have circulated in recent weeks that Huckabee -- once McCain's rival -- may be on the Arizona senator's list of potential running mates. The McCain campaign has neither confirmed nor denied this, and is keeping any information about his list of prospects close to the vest.

Earlier this week, Huckabee started a political action committee called Huck PAC. The group's Web site declared that the new organization would raise money for conservative Republican candidates and it was " committed to helping Republicans regain control of the House and Senate, regain a majority of governorships and elect John McCain as the 44th President of the United States."

FOX News' Serafin Gomez contributed to this report.