Presumptive GOP nominee Donald Trump said that it was possible that a Muslim judge would be biased against him when asked in an interview aired Sunday for his views after proposing a ban an all Muslims.

Trump reiterated on CBS News’ “Face the Nation” that he thought U.S. District Judge Gonzalo Curiel, who is presiding over the federal fraud case against Trump University, was biased toward him because he was “very strongly pro-Mexican.”

CBS host John Dickerson asked Trump if he thought he wouldn’t be able to be treated fairly by a Muslim judge.

“It’s possible, yes. Yeah,” Trump replied. “That would be possible, absolutely.”

“He is a member of a club or society, very strongly pro-Mexican, which is all fine. but I say he’s got bias. I want to build a wall,” Trump said, referring to the wall he wants to build between the U.S. and Mexico.

CBS host John Dickerson asked Trump if he believed in what Dickerson called an American tradition of not judging people based on their families.

“I’m not talking about tradition–I’m talking about common sense, okay?” Trump replied.

This post has been updated.