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The Tea Party-affiliated group is airing two weeks of radio ads attacking the senator in Atlanta, making him their fourth target, alongside Sens. Lindsey GrahamLindsey GrahamCongress should pass the RAC Act to protect Dreamers Juan Williams: Trump morphs into Nixon This week: Congress awaits Comey testimony MORE (R-S.C.), Lamar AlexanderLamar AlexanderSenate GOP short on ideas for stabilizing ObamaCare markets GOP senators push Trump for DOE research funding Key chairman open to delaying repeal of ObamaCare mandate MORE (R-Tenn.) and Richard BurrRichard BurrOvernight Cybersecurity: Flynn refuses to comply with Senate subpoena | Chaffetz postpones hearing with Comey | Small biz cyber bill would cost M | New worm spotted after 'Wanna Cry' Senate Intel leaders: 'We will vigorously pursue' Flynn testimony Overnight Defense: Flynn sets up potential subpoena showdown | Trump says he never mentioned 'Israel' to Russians | Pentagon accused of overbilling for fuel MORE (R-N.C.). Like Burr, Isakson isn't up for reelection until 2016.

"Republicans in Congress can stop ObamaCare by refusing to fund it, but Sen. Johnny IsaksonJohnny IsaksonOutside money pours into marquee House race Lawmakers move to establish new VA office ordered by Trump GOP senators on Comey firing: Where they stand MORE refuses to join the fight," the ad intones. "Johnny Isakson voted to give President Obama money to implement ObamaCare earlier this year, and he'll do it again if you don't make your voice heard."

The ad is part of a broader campaign to push Republicans to back Sen. Mike LeeMike LeeAbortion poses hurdle for Senate healthcare bill GOP senators to Turkey: Apologize for DC brawl Rolling back net neutrality would hurt minorities and low-income families MORE's (R-Utah) campaign to use the impending debate over funding the government to try to force Democrats to defund ObamaCare. So far, 14 GOP senators have signed on, but a number of others have disagreed with the plan.