Hillary Clinton has urged the US state department to release the emails she wrote from a private email account as secretary of state, weighing in on a controversy that has generated negative attention this week for the likely Democratic presidential candidate.
In a tweet, Mrs Clinton said: "I want the public to see my email. I asked State to release them. They said they will review them for release as soon as possible."
Secretary of state John Kerry said the state department will move immediately to review emails that Mrs Clinton wrote on her personal account, though he said that will take time.
Revelations that Mrs Clinton exclusively used a private email account for official business when she was secretary of state were fast becoming a distraction as she takes steps towards a likely presidential campaign in 2016.
The former first lady is the overwhelming favourite for the Democratic nomination, although she has not formally announced her candidacy.
With the election 20 months away, it is unclear how the emails will affect her prospects in the long term. But Republicans, who control the investigative powers of Congress, say the revelations reaffirm their long-held portrayal of both former president Bill Clinton and his wife as secretive and playing by their own rules.
Mr Kerry was asked if the department should look at emails outside those already provided by Mrs Clinton. He said he thought the department had all the emails related to the state department but said he would check.
"We will undertake this task as rapidly as possible in order to make sure that we are dealing with the sheer volume in a responsible way," Mr Kerry said, speaking in Riyadh, Saudi Arabia.
Mrs Clinton's public comments came after she did not address the matter during a speech on Tuesday, and she still has not explained why she used her own server and eschewed a state department email address.
The top Democrat on the House committee investigating the fatal 2012 attack on the US mission in Benghazi, Libya, praised Mrs Clinton's call for the state department to release her emails.
"As far as I am aware, no other cabinet secretary in history has ever called for the release of his or her emails - in their entirety and throughout his or her tenure," said Representative Elijah Cummings.
Mrs Clinton's handling of the Benghazi attack and its aftermath has long been criticised by Republicans. Mr Cummings noted that last year the state department provided 55,000 pages of documents and last month submitted 800 pages of emails to the committee related to Benghazi.
At the White House, a person familiar with the matter said the counsel's office there was not aware at the time Mrs Clinton was secretary of state that she relied solely on personal email, and found out only as part of the congressional investigation into the Benghazi attack.
The person said Mrs Clinton's exclusive reliance on personal email as the nation's top diplomat was inconsistent with the guidance given to agencies that official business should be conducted on official email accounts.
Once the state department turned over some of her messages in connection with the Benghazi investigation after she left office, making it apparent she had not followed the guidance, the White House counsel's office asked the department to ensure that her email records were properly archived, according to the person.
The chairman of the House oversight and government reform committee, Republican Jason Chaffetz, plans to investigate whether Mrs Clinton may have violated federal requirements that written communications of officials are preserved. The committee will join with a special committee investigating the 2012 attacks in Benghazi which issued subpoenas on Wednesday for Mrs Clinton's emails when she was secretary of state.
Mrs Clinton's team said this week she acted no differently from her predecessors at the state department who also used private email addresses.
Last year, Mrs Clinton provided the state department with the 55,000 pages of emails after the department asked her and other former secretaries for records that should be preserved. Yet her team alone decided what would be turned over and should not, without any outside control or clarity on how those decisions were made.