Democratic White House hopeful Hillary Clinton was quizzed Saturday by the FBI about her use of personal email while serving as secretary of state, a campaign spokesman said.

"Secretary Clinton gave a voluntary interview this morning about her email arrangements while she was secretary" of state, spokesman Nick Merrill said in a statement. 

"She is pleased to have had the opportunity to assist the Department of Justice in bringing this review to a conclusion. Out of respect for the investigative process, she will not comment further on her interview."