FORT LAUDERDALE, Fla. -- A prominent Florida church says a grandson of a famed U.S. preacher has stepped down as its pastor after a "moral failure."

Tullian Tchividjian, the grandson of Rev. Billy Graham, a renowned protestant minister who rallied crowds and served as an adviser to several U.S. presidents, resigned several days ago for actions that "disqualify him from continuing to serve as senior pastor," the Coral Ridge Presbyterian Church said Monday. No further details were given.

Tchividjian did not comment on the matter on his webpage and did not respond to a call seeking comment.

He joined the seminary after years of youthful transgressions, offering a prodigal son story when he ascended to the ministry. He became pastor of Coral Ridge in 2009.