Federal Bureau of Investigations Director James Comey is 'increasingly convinced' that Democratic frontrunner Hillary Clinton broke the law with her private email setup, says the New York Post, citing unnamed 'career agents.'

The paper charges that Comey is contemplating pushing for charges but doesn't have the backing of the Obama White House, who would like to see Clinton elected over Republican frontrunner Donald Trump.

Without such political will, agents have begun whispering to their friends in the private sector, telling them Comey is getting stonewalled, writes reporter Charles Gasparino.

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Stonewalled? Career agents are whispering to their friends in the private sector - and to the New York Post - suggesting that FBI head James Comey is facing political pressure not to charge Hillary Clinton

The government hasn't revealed much about the ongoing FBI investigation except to say that Hillary Clinton's aide Bryan Pagliano was granted immunity

The official government line is a 'no comment' from the FBI.

Any evidence that the FBI uncovered has still not been made public.

The government says no final decision has been made, however the case is clearly progressing as Clinton aide Bryan Pagliano, who worked on her private server, was granted immunity by the Justice Department earlier this month.

'You don't start granting people close to Clinton immunity unless you are seriously looking at charges against your target,' one of Gasparino's sources said.

Clinton has publicly said that using a private email account attached to a homebrew server was a 'mistake.'

Mainly 'because it's caused all this uproar and commotion.'

She's defended the practice by pointing to her predecessors including Secretaries of States Colin Powell and Condoleezza Rice, who were appointed by Republicans.

She's said any classified material found among the emails now that they're public is due to retroactive classification and none of her messages were marked classified at the time.

FBI agents suggest that FBI Director James Comey could resign over the Hillary Clinton email scandal if the Obama Justice Department decides not to pursue charges

Gasparino's sources counter this by saying that high-level government officials know that emails not marked classified may still be top secret.

Additionally, they say that officials know that private servers are easier to hack.

So Comey and his associates 'increasingly doubt Clinton’s story.'

As FBI director, however, Comey can only recommend charges to the Justice Department, led by Obama appointee, Attorney General Loretta Lynch.

Insiders told the New York Post that evidence would have to be 'overwhelming' for Comey to make such recommendations and for Obama's Justice Department to pursue them.