​FBI eyes thumb drive in connection to Hillary Clinton emails

WASHINGTON -- The FBI is trying to determine whether Hillary Clinton's use of a personal email account and private server at her home in Chappaqua, New York exposed any classified information -- something Clinton has repeatedly denied.

A U.S. government source confirms FBI agents contacted a Denver tech company that helped to manage her private system.

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Agents also reached out to Clinton's lawyer, David Kendall, asking about the security of a thumb drive he kept with copies of Clinton's emails.

The inquiry comes after flags were raised by the intelligence community's inspector general. He reported that a review of 40 of Clinton's emails revealed "four emails" that "contained classified information when they were generated."

State Department spokesman Mark Toner disputed that Wednesday.

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"Through our process we have not seen anything that former Secretary Clinton has given to us that should have been classified at the time," said Toner.

He said the department sent a security expert to Kendall's law firm to examine how the thumb drive is stored.

"We simply cleared the site where they're being held, made sure that it was a secure facility, and capable of holding what could be classified material," said Toner.

In a statement, Clinton's lawyer downplayed the FBI'S inquiry calling it, "quite predictable" that agents would reach out to him to make sure sensitive materials are properly stored. As of now no criminal investigation has been launched.

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    Nancy Cordes is CBS News' congressional correspondent.