Mills - who has been with Clintons since '93 - didn't want her to run

One of Hillary Clinton's closest aides didn't want her to run for President - and that could be because she was the one who gave the thumbs-up for using the private server, it has emerged.

Cheryl Mills, who was given partial immunity in the FBI's probe into the Clinton email server, could have been the one who told Clinton she could use the private server for work - and should have been 'drawn and quartered,' according to insiders.

The remarks came in the latest batch of WikiLeaks emails taken from the account of Clinton campaign chair John Podesta, Fox News reported.

Reluctant: Cheryl Mills (pictured left), one of Hillary Clinton's closes aides, didn't want Clinton to run for president, it has emerged in emails acquired by WikiLeaks

Leaked: Campaign chair John Podesta (left) told Neera Tanden (right) that he thought Mills told Clinton that the private server was all right to use - hence her reluctance

In an exchange between Podesta and Neera Tanden, head of the Center for American Progress, on July 24, 2015, Tanden asked who was responsible for the server.

That was the day it was reported that the The State Department and Intelligence Community inspector generals had found four emails containing classified information out of a random sample of 40, and passed the case up to the heads of the FBI.

'Do we actually know who told Hillary she could use a private email?' she asked, as the FBI investigation was picking up steam.

'And has that person been drawn and quartered?' she added. 'Like whole thing is f**king insane.'

'Don't you think Cheryl?' speculated Podesta, later adding 'At least we now know why Cheryl didn't want her to run.'

Close: Mills has worked with the Clintons since 2009, and was Hillary's counsel as secretary of state. She also helped on Clinton's 2008 presidential run, but apparently lost faith

The pair had also discussed Mills earlier in the year, in March, just after the news about the server became public.

'This is a Cheryl special,' he said of the server. 'Know you love her, but this stuff is like her Achilles heal. Or kryptonite. She just can't say no to this s**t.

'Why didn't they get this stuff out like 18 months ago?' he asked, possibly referring to reports in March 2013 that revealed for the first time the clintonemail.com address in the wake of Benghazi leaks by hacker Guccifer. 'So crazy.'

'I guess I know the answer,' Tanden replied. 'They wanted to get away with it.'

Mills, a lawyer and CEO of a group that grows enterprises in Africa, has been a close ally of the Clintons since 1993, when she was associate counsel to Bill Clinton's White House, and later advised him during his impeachment.

She was counselor and chief of staff to Hillary Clinton during her entire tenure as United States Secretary of State, and worked on Clinton's 2008 presidential run.

The FBI investigation uncovered that she had communicated extensively on the clintonemail.com server, and she exchanged partial immunity in exchange for access to her laptop.