ADVERTISEMENT
“We’ve done a lot of good things in the last five to six years,” he told reporters in Helena Wednesday, according to Helena's Independent Record. “We can’t let the negative ads running against us … make me something that I’m not.”

Rehberg, meanwhile has been hammering Tester as an ally of President Barack ObamaBarack Hussein ObamaJudge rules against Trump administration in teen pregnancy prevention case Parkland student rips Obama for essay on shooting survivors Obama pens Time 100 entry for Parkland survivors MORE, who remains unpopular in the state, especially on the issue of healthcare reform.

But Rehberg has also had to grapple with reports that he received tens of thousands of dollars last year from lobbyists who did not properly disclose their place of employment. Rehberg has hammered Tester as a top recipient of lobbyist campaign funding.

"We not only comply with the law, we make every effort to go above and beyond it," said Chris Bond, a spokesman for Rep. Rehberg, in a statement to The Hill.

"This is all done in the light of day in publicly available documents and we believe that transparency is a good thing, because it allows folks in Montana to know that contrary to his rhetoric, Jon TesterJonathan (Jon) TesterThe Hill's Morning Report: 200 Days to the Election Koch network targets Tester with new six-figure ad buy Senators grill alleged robocall kingpin MORE is the number one recipient of lobbyist campaign cash in the country."

Julian Pecquet contributed to the reporting of this article.