Secretary of State John F. Kerry said he believes Afghan officials will approve a security agreement that would allow U.S. forces to remain in that country beyond 2014.

"I believe that [Afghan President] Hamid Karzai -- either he or his successor -- will sign this," Kerry said in a taped interview that aired Sunday on ABC's "This Week."

Karzai has said he will not support a security agreement unless the United States promises to end airstrikes and raids on homes, in addition to helping broker peace with the Taliban.