(CNN)-- Michele Bachmann campaign manager Ed Rollins is stepping into an advisory role and deputy manager David Polyansky is leaving the campaign, Rollins said Monday.Rollins, who's 68 and had a stroke a year and a half ago, cited health reasons for his decision."I just don't have the endurance to go 12 to 14 hours a day, seven days a week anymore," Rollins told CNN's Anderson Cooper on Monday.Rollins said he still has great affection for Bachmann and pledged to give her counsel moving forward.