By Alexandra Jaffe - 08/26/13 02:25 PM EDT
The ad notes Flake's refusal to sign a letter, circulated by conservative lawmakers, pledging to vote against any budget that includes funding for the healthcare law — essentially a threat to shut down the government if the law isn't defunded.
"Jeff Flake won’t stand up to President Obama and join conservatives in pledging to oppose funding for the implementation of ObamaCare," a narrator says in the ad, which will run for two weeks starting Tuesday and is backed by a $31,750 buy.
The group has also hit Sens. Richard Burr (N.C.), Lindsey Graham (S.C.), Lamar Alexander (Tenn.), Johnny Isakson (Ga.) and Thad Cochran (Miss.) with ads on the issue.
Most of those targeted have been outspoken critics of the law and have voted repeatedly to repeal it, but SCF's ads are an indication they could face backlash from conservatives as the fight over ObamaCare comes to a head this fall.
Flake, in fact, said at a town hall meeting in Arizona last week that "I would love to defund ObamaCare, but the continuing resolution is not the mechanism."
His position highlights a growing chasm within the GOP over how to tackle the law going forward. Other conservative groups, including Heritage Action, Tea Party Patriots and ForAmerica have targeted lawmakers for refusing to commit to the defund effort.
But some Republicans believe the party could suffer the blame if the conflict results in a government shutdown, a prospect that they worry could cost them seats in 2014.