The FBI investigation into the Clinton Foundation is far more expansive and aggressive than previously thought, Fox News reported Wednesday night.

Fox, citing sources with knowledge of the probe, also reported an indictment of key foundation players is likely.

“We are headed to a constitutional crisis. It’s shameful. They think they are going to get away with it. But I think the field agents are going to put a stop to it.”

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The potential bombshell report from Bret Baier of Fox News notably did not indicate if a grand jury has been convened as part of the investigation into the foundation.

“It’s hard to get an indictment without a grand jury,” Jim Kallstrom, former assistant director of the FBI, told LifeZette.

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Law enforcement experts, Kallstrom among them, say a grand jury should be convened immediately in the Clinton case — unless one already exists.

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“The evidence is overwhelming,” said Kallstrom.

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Kallstrom and Joseph E. diGenova, former U.S. attorney for the District of Columbia, said the Justice Department and Attorney General Loretta Lynch are both ignoring the evidence, and likely holding up the creation of a grand jury, because Clinton is Obama’s choice for president.

The top five officials at the Justice Department, including Lynch, have decided not to pursue the cases — and to accommodate Clinton, according to diGenova.

He cites Lynch’s meeting with President Bill Clinton on a Phoenix airport tarmac on June 27. The secret meeting went unnoticed until a local TV reporter spotted it.

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“We are headed to a constitutional crisis,” said diGenova on Thursday. “It’s shameful. They think they are going to get away with it. But I think the field agents are going to put a stop to it.”

FBI Director James Comey told Congress on Friday that the FBI was relaunching its investigation into Clinton’s use of a private email server as secretary of state.

Subsequent news coverage exposed details of a yearlong investigation into the Clinton Foundation, indicating the chief priority for federal agents may not be Clinton’s handling of classified material, but rather official corruption between the State Department and her family foundation during her tenure.

A steady leak of emails from Clinton campaign Chair John Podesta, courtesy of WikiLeaks, has shown Clinton definitely met with foundation donors while she was secretary of state — and that top aides considered those donations when making decisions on the meetings.