Election Day is still a week away, but Sen. Ron Johnson (R-WI) already has his eye on the possible impeachment of a president Hillary Clinton over her use of a private email server.

“This was willful concealment and destruction,” Johnson told the Beloit Daily News in a Monday interview flagged by the Huffington Post.

Johnson’s comments referred to federal laws related to the willful gathering or destruction of information related to national defense.

“I’m not a lawyer, but this is clearly written,” Johnson said of 18. U.S. Code 2071, which dictates that anyone who concealed or removed such official records is disqualified from holding U.S. office. “I would say yes, high crime or misdemeanor, I believe she is in violation of both laws.”

Johnson, who endorsed Donald Trump, told the local Wisconsin newspaper that the FBI’s investigation concluding there was no case to prosecute the former secretary of state was “corrupt.”

The vulnerable Republican senator is significantly trailing behind Democratic challenger Russ Feingold. Johnson has 43.2 percent support to Feingold’s 50.7 percent, according to TPM’s PollTracker Average.

In the wake of FBI Director James Comey’s surprise announcement that the agency was looking into a recently discovered batch of emails potentially related to the server case, Republicans have amped up their claims that Clinton engaged in criminal activity. Comey said he had not yet reviewed the content of the emails, which were sent by Clinton aide Huma Abedin.

Yet Fox News on Monday mapped out a chart for how Clinton could be impeached once elected.