In an interview with Chuck Todd Sunday morning, Bernie Sanders tweaked his criticism of Hillary Clintion saying she is qualified to be president but that something is wrong with her judgment.

Sanders was referring to a spat the Democratic candidates had last Thursday after an article in the Washington Post suggested Clinton was questioning whether Sanders was qualified to be president. Sanders lashed out in response, offering a list of reasons why he thought Clinton herself was unqualified.

The fiery argument between the two candidates led to a several stories in which Democrats lamented that Sanders was threatening to turn the nomination contest into a real battle, one that could get just as ugly like the GOP nomination. “I’m hopeful everybody can just take a deep breath,” Sen. Debbie Stabenow told Politico.

Sanders did walk back his comments about Hillary’s qualifications on Friday but Sunday he used a new formulation on Meet the Press. “She may have the experience to be president of the United States. No one can argue that. But in terms of her judgment, something is clearly lacking.”

“When you vote for virtually every trade agreement that has cost the workers of this country millions of jobs. When you support and continue to support fracking, despite the crisis that we have in terms of clean water. And essentially when you have a SuperPAC that is raising tens of millions of dollars from every special interest out there, including $15 million from Wall Street–the American people do not believe that that is the kind of president that we need to make the changes in America to protect the working families of this country.”