In a Washington Post op-ed, MSNBC’s Joe Scarborough criticized billionaire presidential candidate Donald Trump after the candidate failed to condemn David Duke and the Ku Klux Klan in a weekend interview on CNN.

From the transcript:

TAPPER: Will you unequivocally condemn David Duke and say that you don’t want his vote or that of other white supremacists in this election?

TRUMP: Well, just so you understand, I don’t know anything about David Duke. OK? I don’t know anything about what you’re even talking about with white supremacy or white supremacists. So, I don’t know.

I don’t know, did he endorse me or what’s going on, because, you know, I know nothing about David Duke. I know nothing about white supremacists. And so you’re asking me a question that I’m supposed to be talking about people that I know nothing about.

TAPPER: But I guess the question from the Anti-Defamation League is, even if you don’t know about their endorsement, there are these groups and individuals endorsing you. Would you just say unequivocally you condemn them and you don’t want their support?

TRUMP: Well, I have to look at the group. I mean, I don’t know what group you’re talking about.

You wouldn’t want me to condemn a group that I know nothing about. I would have to look. If you would send me a list of the groups, I will do research on them. And, certainly, I would disavow if I thought there was something wrong.

TAPPER: The Ku Klux Klan?

TRUMP: But you may have groups in there that are totally fine, and it would be very unfair. So, give me a list of the groups, and I will let you know.

TAPPER: OK. I mean, I’m just talking about David Duke and the Ku Klux Klan here, but…

TRUMP: I don’t know any — honestly, I don’t know David Duke. I don’t believe I have ever met him. I’m pretty sure I didn’t meet him. And I just don’t know anything about him.

In his op-ed, Scarborough shared his concern that Donald Trump hesitated to condemn the group.

“A simple ‘yes’ would have worked,” he wrote. “But on Sunday, Donald Trump swatted away the easy answers and instead feigned ignorance about the KKK and its most infamous Grand Wizard. The Republican frontrunner’s failure to provide what should have been a simple answer has raised even more disturbing questions about the man who is on course to lock down the GOP’s nomination for president.”

Trump’s answer, Scarborough said, was “more like a Dixiecrat for the 1950’s” and not the party of Lincoln.

“So is this how the party of Abraham Lincoln dies?” he asked.