Republican presidential candidate Ted Cruz paid a visit to “The Late Show with Stephen Colbert” Monday night to discuss his run for the White House, but it was his stance on marriage equality that received boos and hisses from the audience.

One moment in the interview that became particularly uncomfortable was when Cruz began to lay out what it is his campaign stands for. “Listen what I’m fighting for are simple principles,” the Texas senator tells Colbert. “Live within our means, stop bankrupting our kids and grandkids and follow the Constitution.”

Colbert then interjected with: “And no gay marriage… and no gay marriage,” which causes Cruz to pause for a second before he jumped back in with this response: “Well, no actually, let’s be precise: under the Constitution, marriage is a question for the states.” Colbert replied, “It doesn’t mention marriage in the Constitution.”

When members of the audience began booing Cruz, Colbert held up his hands and reminded them to be civil: “However you feel, he’s my guest, so please don’t boo him,” Colbert said.

Cruz continued: “I don’t think we should trust governing our society to five unelected lawyers in Washington,” he said, referring to the U.S. Supreme Court’s June 26 ruling which made same-sex marriage the law of the land.

Check out the interview from The Late Show with Stephen Colbert below: