Glenn Beck, a Ted Cruz supporter for many years, took to the airwaves Monday to apologize to his talk-radio listeners for supporting the Texas senator.

Before his apology on The Glenn Beck Show, Beck interviewed Cruz about his decision to endorse Donald Trump for president. Cruz made hay at the Republican National Convention in July after he encouraged Republicans to "vote their conscience."

Cruz endorsed Trump last Friday. On Monday, The Texas senator told Beck that the election "is a binary choice" between Trump and Hillary Clinton. Cruz said he was never part of the "Never Trump" movement, but he was always "Never Hillary."

Beck pressed Cruz to share "new information" about why Cruz changed his mind and issued the endorsement.

"What I was trying to do in Cleveland was lay out a path to uniting Republicans," Cruz said. "This is about principle, about ideas. That's the test I'm applying. What I do know is that Hillary Clinton fails that test profoundly."

Beck told listeners after the interview had ended that he had just "heard Ted Cruz calculate." He ended the program by apologizing for supporting Cruz. Beck said he should have instead backed Marco Rubio.

"That was so calculated that it was stunning to me," Beck said. "I think I have to apologize and say, maybe, perhaps, those of you who said Ted Cruz is calculating and a smarmy politician, I think I may have to slightly agree with you and apologize for saying, 'No, he wasn't.'"

Listen to the interview here

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