Rep. Denny Rehberg (R-Mont.) will challenge Sen. Jon TesterJonathan (Jon) TesterDemocratic senator: 'The ultimate of ironies' for Trump to hit Romney for invoking his faith Committee on Veterans Affairs sends important message during tense Senate time Democrats cry foul over Schiff backlash MORE (D-Mont.) in 2012, giving Republicans another solid candidate in a race that will be one of the party's top targets next year.  

Rehberg will officially get into the race this weekend at a GOP dinner in Montana, a Republican source with knowledge of Rehberg's plans confirmed to The Ballot Box. 

His entry into the race was first reported by Roll Call late Monday. 

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Rehberg's candidacy is more good news for Senate Republicans looking to take back the majority in the upper chamber next year. In his sixth term occupying the state's at-large congressional seat, Rehberg has a strong statewide profile and the ability to raise the funds needed for a Senate race.

It will be the second Senate race of Rehberg's career — he launched an unsuccessful challenge to Sen. Max BaucusMax Sieben BaucusBaucus backing Biden's 2020 bid Bottom line Overnight Defense: McCain honored in Capitol ceremony | Mattis extends border deployment | Trump to embark on four-country trip after midterms MORE (D-Mont.) in 1996, before he was elected to the House. 

The latest campaign filings show Tester with just a modest cash edge at the start of the year. The Democrat has some $562,000 cash on hand, while Rehberg reported $553,000 on hand.

Republican businessman Steve Daines is already in the race against Tester and posted a solid fundraising start, pulling in some $225,000 since getting in. With Rehberg now in the Senate race, though, Daines is reportedly looking at a run for the state's at-large House seat instead.

-Updated at 10:05 a.m.