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 ObamaOvernight Energy: Trump EPA finalizes rule to kill Obama climate plan | Trump officials delayed releasing docs on Yellowstone superintendent's firing | Democrats probe oil companies' role in fuel rule rollback Overnight Energy: Trump EPA finalizes rule to kill Obama climate plan | Trump officials delayed releasing docs on Yellowstone superintendent's firing | Democrats probe oil companies' role in fuel rule rollback House Democrats investigate oil companies' involvement in fuel standards rollback 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) TesterVA chief pressed on efforts to prevent veteran suicides VA chief pressed on efforts to prevent veteran suicides Overnight Defense: US to send 1K more troops to Mideast amid Iran tensions | Iran threatens to break limit on uranium production in 10 days | US accuses Iran of 'nuclear blackmail' | Details on key defense bill amendments MORE is the number one recipient of lobbyist campaign cash in the country."

Julian Pecquet contributed to the reporting of this article.