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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 Olin GrahamSunday shows preview: Questions linger over Trump-Putin summit Soccer ball Putin gifted to Trump gets routine security screening Graham: Biggest problem is Trump ‘believes meddling equals collusion’ MORE (R-S.C.), Lamar AlexanderAndrew (Lamar) Lamar AlexanderMontana governor raises profile ahead of potential 2020 bid Dems pressure GOP to take legal action supporting pre-existing conditions Trump administration to explore importing prescription drugs MORE (R-Tenn.) and Richard BurrRichard Mauze BurrCongress should build upon the ABLE Act, giving more Americans with disabilities access to financial tools Christine Todd Whitman: Trump should step down over Putin press conference GOP lambasts Trump over performance in Helsinki 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 IsaksonJohn (Johnny) Hardy IsaksonOvernight Defense: Trump inviting Putin to DC | Senate to vote Monday on VA pick | Graham open to US-Russia military coordination in Syria Senate to vote Monday on Trump's VA nominee GOP senators introduce resolution endorsing ICE 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 LeeMichael (Mike) Shumway LeeWisconsin GOP Senate candidate rips his own parents for donations to Dems GOP moderates hint at smooth confirmation ahead for Kavanaugh GOP senators introduce resolution endorsing ICE 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.