Jeb Bush is enlisting the help of his famous brother as the presidential race turns to South Carolina.
A new radio ad airing in the state features former president George W. Bush advocating for his brother's credentials as a "good leader" who is the best qualified candidate for commander-in-chief of the American military.
"This is President George W. Bush," he says in the ad. "We live in troubled times with the military deployed around the world. We need a strong leader with experience, ideas and resolve. There's no doubt in my mind that Jeb Bush will be a great commander in chief for our military."
The 43rd president also advocates for his brother's leadership during crises he faced during his time as the governor of Florida.
"In a time of crisis, he will be a steady hand," he says in the radio spot.
Jeb Bush is scheduled to campaign in South Carolina on Wednesday and Thursday.
This article first appeared on NBCNews.com.