Popular Republican presidential candidate Michele Bachmann lost two campaign aides Tuesday.

Bachmann's campaign chief Ed Rollins said health reasons are preventing him from keeping up with the 12 and 14 hour days a presidential campaign sometimes requires. The 68-year-old GOP strategist had a stroke last year.

In response to Rollins' departure, Bachmann said she's "grateful for his guidance and leadership."

"And fortunate to retain his valuable advice even though his health no longer permits him to oversee the day-to-day operations of the campaign," she added.

Click play for more on Bachmann's campaign shake up with CBN News Chief Political Correspondent David Brody.

Rollins' close deputy David Polyansky also decided that this was a good time for him to leave the campaign.

Rollins said Texas Gov. Rick Perry changed the dynamic when he joined the field.

He said he feels the GOP race is between Perry and former Massachusetts Gov. Mitt Romney, with Bachmann coming in third.