HELENA — Sen. Jon Tester, D-Mont., and Rep. Denny Rehberg, R-Mont., continue to cast political stones over a controversial measure that would give the Department of Homeland Security "operational control" over federal lands along the United States' borders.

Tester and Rehberg are locked in what many political observers predict will be one of the toughest U.S. Senate races in the nation, and the so-called "border bill" has become one of the biggest issues of the campaign to date.

Tester believes Rehberg's co-sponsorship of House Resolution 1505 won't sit well with Montana voters who value public lands.