The Council on American-Islamic Relations is calling on Republican presidential candidate Ben Carson to withdraw from the race after he said he would not agree with a Muslim being elected president. Carson made the comments on NBC’s Meet the Press with Chuck Todd.

Ben Carson: “Well, I guess it depends on what that faith is. If it’s inconsistent with the values and principles of America, then of course it should matter. But if it fits within the realm of America and consistent with the Constitution, no problem.”

Chuck Todd: “So do you believe that Islam is consistent with the Constitution?”

Ben Carson: “No, I don’t. I do not.”

Chuck Todd: “So you— ”

Ben Carson: “I would not advocate that we put a Muslim in charge of this nation. I absolutely would not agree with that.”

Carson’s campaign has defended the remarks, saying there is a “huge gulf” between the Muslim faith and “our Constitution and American values.” Carson’s comments came after fellow Republican contender Donald Trump was criticized for failing to correct a supporter who called Obama a Muslim at a town hall event last week. On Sunday, Trump told Chuck Todd he was willing to take Obama at his word when the president said he was a Christian. He also said that some people already think we have a Muslim president.