Story highlights Trump's comments are his most direct call yet for Clinton to face jail time

Trump also suggested he would direct his attorney general to investigate her

San Jose, California (CNN) Donald Trump on Thursday called for his likely Democratic rival Hillary Clinton to be imprisoned.

"I will say this, Hillary Clinton has got to go to jail," Trump told supporters here as he slammed Clinton's foreign policy speech earlier in the day in which Clinton called Trump dangerous and "temperamentally unfit" to be president.

"Folks, honestly, she's guilty as hell," Trump said of the Clinton's use of a private email server during her time as secretary of state.

Trump has previously accused Clinton of breaking federal law, but his comments on Thursday are his most direct call yet for Clinton to face jail time over her use of private email to conduct official State Department affairs.

The FBI is investigating Clinton's use of a private emails to determine whether anyone improperly handled classified information.

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