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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 GrahamKim, Moon toss ball to Trump in ‘last, best chance’ for Korean peace GOP senator: Kavanaugh accuser 'moving the goalposts' Collins: Kavanaugh accuser should 'reconsider,' testify on Monday MORE (R-S.C.), Lamar AlexanderAndrew (Lamar) Lamar AlexanderOvernight Health Care: Senators target surprise medical bills | Group looks to allow Medicaid funds for substance abuse programs | FDA launches anti-vaping campaign for teens The Hill's Morning Report — Sponsored by United Against Nuclear Iran — Kavanaugh confirmation in sudden turmoil Cruz gets help from Senate GOP in face of serious challenge from O’Rourke MORE (R-Tenn.) and Richard BurrRichard Mauze BurrTrump assures storm victims in Carolinas: 'We will be there 100 percent' Overnight Energy: Trump rolls back methane pollution rule | EPA watchdog to step down | China puts tariffs on US gas Graham: Mueller is going to be allowed to finish investigation 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 IsaksonTrump blasts Tester at Montana rally: 'He loves the swamp' Renaming Senate office building after McCain sparks GOP backlash GOP senator warns Trump: Anyone who trash-talks McCain 'deserves a whipping' 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 LeeReexamining presidential power over national monuments Utah group complains Mia Love should face criminal penalties for improper fundraising Senate approves 4B spending bill 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.