As new evidence indicates some of former Secretary of State Hillary Clinton's emails may indeed be lost because she used a private account to discuss state business, as the Atlantic reports, Sen. Dianne Feinstein, a top Democrat, called for more action.

Clinton supporters defended her in using a private account, stating she emailed colleagues at their government addresses so there would be a copy of all messages on government servers available for archivists.

Public records showed, however, some of Hillary Clinton's staff used private email addresses as well and that Clinton sent messages to third parties about government business.

At least some correspondence was discovered by Gawker reportedly between Clinton and Sidney Blumenthal, a staffer in former President Bill Clinton's White House, discussing government business through private email accounts.

The emails indicated Blumenthal regularly sent Clinton freelance reports including information and advice about the 2012 attacks in Benghazi, Libya. Gawker says it had requested the State Department release emails between Hillary Clinton and Blumenthal but was told the agency couldn't find them.

Sen. Dianne Feinstein called on Hillary Clinton to "step up and come out" to explain in more detail why she used a personal email account to conduct government business during her time as secretary of state, The Washington Post reports.

"What I would like is for her to come forward and say just what the situation is, because she is the preeminent political figure right now," Feinstein said on Sunday regarding to Clinton as the "leading candidate" for president.

Feinstein did not accuse the former Secretary of State of doing anything wrong but suggested she speak on the issue because "from this point on the silence is going to hurt her."

The New York Times broke the story of Hillary Clinton using a personal email last week, even after she handed over 55,000 pages of emails last year to the State Department.