Republican South Carolina Sen. Lindsey Graham declined Fox News host Tucker Carlson’s invitation to debate White House adviser Stephen Miller on his show, Carlson said Monday night.

Graham’s refusal to debate Miller, who accepted the debate invitation from Carlson, came after the senator called Miller an “extremist” on the subject of immigration.

“Over the weekend Senator Lindsey Graham announced that White House advisor Stephen Miller is an extremist on immigration. It is Miller’s fault he says that the Senate can’t work out a deal on DACA. He is in the U.S. Senate and Stephen Miller is not. Graham didn’t explain how miller was wrong, he just said he was extreme and should therefore shut up,” the Daily Caller co-founder said.

“We spoke to Stephen Miller and he’s perfectly willing to come on the show and debate Senator Graham directly about their differences on immigration. That would be fascinating, we would all benefit from that but Graham has refused. Why? The truth is that Lindsey Graham is the one with an extreme position on immigration,” Carlson continued. (RELATED: Lindsey Graham Wants Trump To Sign Bigger Amnesty Package Than Even Jeb Wanted)

“Nothing personal, but the numbers show it. The new Harvard Harris poll last week showed that 81 percent of Americans want immigration reduced below current levels, large majorities want skill-based immigration and an end to the diversity lottery and a more secure border.”

Graham, Carlson said, is “on the wrong side of the public on every one of those issues. He is literally an extremist. He is still welcome on the show anytime to explain himself. That invitation stands, as it always has.”

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Graham’s office declined TheDC’s request for comment.