A Romanian computer hacker who is being extradited to the U.S. told NBC News that he gained access to Hillary Clinton’s “completely unsecured” private email server.

Marcel Lehel Lazar, better known by the name “Guccifer,” first exposed Mrs. Clinton’s private email address and released to The Smoking Gun email exchanges between her and longtime adviser Sidney Blumenthal, making his claim plausible.

Mr. Lazar, who is in custody in the U.S. on hacking charges, said Mrs. Clinton’s server was like “an open orchid on the Internet … there were hundreds of folders.” In a separate interview with Fox News, he said the hacking “was easy … easy for me, for everybody.”

Mr. Lazar has a trial set for September on charges of hacking such political leaders as Gen. Colin Powell and Mr. Blumenthal.

Mrs. Clinton has always said her server was not breached. In a statement Wednesday night, the Clinton campaign said Mr. Lazar had no credibility, referring to “this criminal [speaking] from his prison cell.”

The statement said “it is unfathomable that he would have gained access to her emails and not leaked them” as he did in other cases.

But NBC reported, citing “a source with knowledge of the probe into Clinton’s email setup” that U.S. investigators intend to question Guccifer about the Clinton server.

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