GOP senator: Hillary Clinton could be impeached

Sen. Ron JohnsonRonald (Ron) Harold JohnsonGOP senators introduce resolution endorsing ICE GOP senator: Trump admin's handling of migrant family reunification 'boggles my mind' GOP senator says sanctions against Russia aren’t working ‘that well’ after trip there MORE (R-Wis.) says Hillary ClintonHillary Diane Rodham ClintonDHS secretary: No sign Russia targeting midterm elections at 2016 level Twitter suspends Guccifer 2.0 and DCLeaks accounts after indictments Elon Musk donated nearly K to Republican PAC, filings show MORE could be impeached if she wins the White House because of the private email setup she used while leading the State Department. 

"She purposefully circumvented it (the law), this was willful concealment and destruction," Johnson told the Beloit Daily News this week, referring to her use of a private email server.

Johnson — who is in the middle of an uphill reelection battle — pointed to two laws tied to willfully destroying or concealing information related to national security, arguing Clinton has violated both of them. 

"I'm not a lawyer, but this is clearly written," he told the local newspaper. "I would say yes, high crime or misdemeanor, I believe she is in violation of both laws." 

The FBI announced last week it was opening a new review into emails potentially tied to its previous investigation into Clinton's private email server. FBI Director James Comey announced in July that, after an initial probe, "no charge are appropriate in this case." 

Johnson, however, called the FBI's initial decision a "corrupt conclusion" and questioned why his Democratic opponent, former Sen. Russ Feingold, is still supporting Clinton. 

"Every election is a binary choice, but she (Clinton) has disqualified herself," he said. "I would love to be voting for Ronald Reagan, and I'm sure the Democrats would rather be voting for Harry Truman, but the reality is that is not our choice."

Asked about defending his own party's nominee, Donald TrumpDonald John TrumpReporters defend CNN's Acosta after White House says he 'disrespected' Trump with question Security costs of Trump visit to Scotland sparks outrage among Scottish citizens Ex-CIA officer: Prosecution of Russians indicted for DNC hack 'ain't ever going to happen' MORE, the GOP senator pivoted, asking: "How does Feingold defend Clinton?"

Johnson's campaign pounced on the FBI's decision, using it to put a spotlight on the GOP push for the State Department to release Feingold's emails from his tenure as the special envoy to the Great Lakes region of Africa and the Democratic Republic of the Congo before the election. 

Feingold has backed the emails' release but noted the timing is up to the State Department. 

Johnson currently trails Feingold in the final week of the election. Though the race has tightened, Feingold is leading by an average of nearly 7 percentage points, according to RealClearPolitics. 

Democrats need to net five seats — or four if they also retain the White House — to take back control of the Senate.