She hasn't been elected president, but one U.S. Senator says he's ready to impeach Hillary Clinton.

In an interview with a Wisconsin newspaper, Sen. Ron Johnson said Clinton's email scandal qualifies as a "high crime or misdemeanor," meaning she could be impeached.

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The U.S. Constitution states, "The President, Vice President and all Civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors."

Talk about impeaching Clinton started more than a year before Election Day 2016, thanks to an Alabama congressman.

"But there's no question that she mishandled classified documents, and she did so intentionally. And that is a criminal offense in the United States code," Rep. Mo Brooks said on MSNBC.

The FBI disagreed with Rep. Mo Brooks' assessment of Clinton's use of a private email server. FBI Director James Comey said Clinton was "extremely careless" with classified information, but he did not recommend any charges.

The FBI's closed investigation recently made headlines again after Comey sent a letter to Congress saying the bureau found new emails that could be pertinent to the case.

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For Clinton to be impeached, she would need to be formally charged by the House of Representatives. Then the Senate would hold an impeachment trial, and if she were convicted, she would be removed from office.

The only two presidents to be impeached in the history of the United States are Andrew Johnson and Bill Clinton. Both were acquitted of wrongdoing.

6 PHOTOS Must-win states for Hillary Clinton See Gallery Must-win states for Hillary Clinton Pennsylvania Hillary Clinton campaigns for President of the United States at University of Pennsylvania on October 22, 2016 in Philadelphia, Pennsylvania. (Photo by Taylor Hill/WireImage) Wisconsin U.S. Democratic presidential candidate Hillary Clinton listens to a question at a campaign event in Madison, Wisconsin, United States, March 28, 2016. (Photo via REUTERS/Jim Young) Michigan Democratic presidential nominee former Secretary of State Hillary Clinton speaks during a campaign rally at Wayne State University on October 10, 2016 in Detroit, Michigan. A day after the second presidential debate in St. Louis, Hillary Clinton is campaigning in Michigan and Ohio. (Photo by Justin Sullivan/Getty Images) Virginia Democratic U.S. presidential candidate Hillary Clinton (C) speaks next to Virginia first lady Dorothy McCauliffe (L) and James Barnett (R) at a discussion on national security during a campaign event at the Virginia Air and Space Center in Hampton, Virginia, U.S., June 15, 2016. (Photo via REUTERS/Gary Cameron) New Hampshire Democratic U.S. presidential nominee Hillary Clinton speaks during a campaign rally at Alumni Hall Courtyard, Saint Anselm College in Manchester, New Hampshire U.S., October 24, 2016. (Photo via REUTERS/Carlos Barria) Minnesota U.S. Democratic Presidential Candidate Hillary Clinton speaks at the American Federation of Teachers conference in Minneapolis, Minnesota, July 18, 2016. (Photo via REUTERS/Adam Bettcher) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

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