A few days ago, presumptive Republican nominee Donald Trump, currently the defendant in a lawsuit charging his now-defunct Trump University with fraud, attacked the presiding judge in a raging campaign rally.

On Thursday Trump upped the ante in his attack, saying in an interview that U.S. District Judge Gonzalo Curiel had “an absolute conflict” in presiding over the court proceedings because he was “of Mexican heritage,” and a member of a Hispanic lawyers’ association. “I’m building the wall, I’m building the wall. I have a Mexican judge. He’s of Mexican heritage. He should have recused himself, not only for that, for other things,” Trump said.

That makes about as much sense as General Eisenhower being rejected as Commanding General of the European Theatre of Operations in World War II due to his German heritage.

University of Pennsylvania law professor Stephen Burbank called Trump’s assertions “absolute nonsense,” and added “If this continues, I would hope that some prominent federal judges would set Mr. Trump straight on what’s appropriate and what’s not in our democracy.”