(CNN) - The recall election against Republican Gov. Scott Walker was ordered on Friday by Wisconsin's Government Accountability Board, the board's public information officer confirmed to CNN.
After more than 900,000 signatures were collected, the group voted five to zero to order an election against the incumbent governor on June 5 and schedule a Democratic primary for May 8.
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Walker has faced intense backlash from a bill passed in February of 2011 to curtail the collective bargaining rights of state employees. Republicans in Wisconsin insisted the move was necessary to control the skyrocketing costs of public employee benefits and close the budget shortfall. Democrats argued it was an attempt to gut public-sector labor unions, one of their core constituencies.
The board announcement comes on the same day the Republican Governors Association launched its second round of ads criticizing Walker's potential Democratic challengers.
The national organization unveiled two ads targeting the Democratic hopefuls, Milwaukee Mayor Tom Barrett and former Dane County Executive Kathleen Falk, who will likely face off in the state's Democratic primary, over policies they said contributed to an increases in unemployment and taxes in their respective cities.
"Typical liberal Madison politician, raised taxes and lost jobs. Kathleen Falk for governor? I don't think so," the narrator said in one of the spots.
"Under Barrett, Milwaukee's one of America's 10 worst cities for unemployment. Spending up, taxes up, unemployment up. Governor Tom Barrett? I don't think so," the narrator in the other spot said.
Although the RGA would not disclose the exact size or duration of the buy, they characterized it as a statewide broadcast and cable effort at significant levels.
Voters in the state remain divided over the impending recall election, according to a new poll. The NBC/Marist survey released Friday showed Wisconsin voters were divided over the upcoming election. Forty-six percent of Badger State voters said they will support Walker in the race, while 48% said they will vote for the eventual Democratic candidate.
Walker's approval and disapproval figures were equal at 48%, while a majority of likely Republican voters said they are following the recall election more closely than the GOP primary race, 51% to 37%.
- CNN's Deanna Proeller contributed to this report.