A Romanian hacker who claimed to have broken into former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE’s personal email server is expected to plead guilty to U.S. criminal charges in a federal court this week.

Court records show that Marcel Lehel Lazar, who goes by the alias “Guccifer,” will change his plea during a hearing in Alexandria, Va. on Wednesday morning.

A spokesman with the U.S. attorney’s office prosecuting Lazar confirmed that he would plead guilty.

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However, it is unclear which charges the 42-year-old will plead guilty to, or whether the move is part of a deal to cooperate with federal officials on other cases.

The hacker has been indicted on nine felony counts related to his hacking into accounts of senior U.S. officials, including former President George W. Bush and ex-Secretary of State Colin Powell. Lazar’s hacking into Bush’s email account exposed self-portraits and other paintings that the former president had after leaving office.

His access to longtime Clinton ally Sidney Blumenthal’s email account first exposed Clinton’s use of a private email account during her time in office. The revelation opened the door to what has been a protracted controversy over the likely Democratic presidential nominee’s personal setup, which has dogged her presidential campaign.

This month, Lazar claimed to have also broken into Clinton's “completely unsecured” server, which he compared to “an open orchid on the internet.”

Clinton’s campaign has dismissed the claim, and the State Department has said it has no reason to believe the hacker.

--This report was updated at 12:46 p.m.