As of 2015, the state had about 852,000 adults with pre-existing conditions that could have prevented them from getting insurance before the health law, according to the Kaiser Family Foundation.

Walker has no credibility on the issue because of his long opposition to the federal law, Evers, his Democratic challenger in the upcoming election, said in a statement.

“Election-year promises won’t cover up Walker’s career of working to sabotage Wisconsinites’ health care and take us back to the days when insurance companies could deny you coverage if you got sick,” Evers said. “He simply has no credibility on this issue, and Wisconsinites have no reason to believe he’d change with another term.”

The Kleefisch ad follows one from a group aligned with the Democratic Governors Association that also featured a woman fighting cancer. In that spot, the woman claims that Walker doesn’t care about families like hers because he’s fought to repeal the health care law and its protections for people with pre-existing conditions.

In her ad, Kleefisch said she was “shocked” that Evers and his allies would argue Walker wants to end the protections.