"What I said is this is a binary choice," he said. "I wish it were not a binary choice. As you know, I tried very very hard, as did you, to prevent it from being a binary choice between Hillary and Donald Trump."
"I am still encouraged by you to abandon my principles and vote because it's a binary choice?" Beck quipped back.
"You are encouraged by me to do what you believe is right and honorable and principled," Cruz said.
Beck pressed the former 2016 presidential hopeful, asking him what changed between the "vote your conscience" speech he delivered at the GOP convention in Cleveland and now.
"This is information that you had in Cleveland. ... You had all this information. You had this information the day you dropped out of the race and said that Donald Trump is a 'sociopathic liar.' So you had all this information," Beck said.
He continued: "Have you spent an enormous amount of time — do you have new information that has made you say, 'Oh my gosh. He's now not a sociopathic liar? He's not the guy that I very eloquently spelled out for over a year. And now suddenly there's a reason to believe him?'
Ted Cruz through the years, with family
Ted Cruz through the years, with family
Texas Solicitor General R. Ted Cruz, left, and Don. R. Willett, right, leave the federal courthouse after a pre-trial hearing on Tuesday, Dec. 9, 2003, in Austin, Texas. Lawyers and federal judges met earlier to plan for the upcoming redistricting trial. Willett is deputy Attorney General for Legal Counsel. (AP Photo/Harry Cabluck)
Ted Cruz, from the Texas Attorney General's Office, speaks to members of the House Ways and Means Committee Tuesday, April 18, 2006, in Austin, Texas. Texas lawmakers embark on a 30-day special session to repair the state's method of paying for public education. Cruz explained the court rulings on school finance to the committee. (AP Photo/Harry Cabluck)
UNITED STATES - MARCH 21: Ted Cruz (R) Texas
(Photo By Douglas Graham/Roll Call)
Texas US Senate Republican primary candidate Ted Cruz, left, talks with his father Rafael Cruz as he works at the campaign's phone bank, on election day, Tuesday, May 29, 2012, in Houston. (AP Photo/Pat Sullivan)
Texas Republican Ted Cruz speaks to reporters Tuesday, May 29, 2012, in Houston. Cruz placed second behind Lt. Gov. David Dewurst in a field of nine candidates in the Republican primary race for a U.S. Senate seat. Cruz and Dewhurst will square off in a second round of voting July 31. (AP Photo/Pat Sullivan)
U.S. Senate Candidate Ted Cruz, right, has a discussion with David Dewhurst supporter Sherri Heinzman before the Texas Federation of Republican Woman luncheon during the Texas Republican Convention in Fort Worth, Texas, Friday, June 8, 2012. Cruz is competing with Dewhurst for the Republican nomination to replace retiring Sen. Kay Bailey Hutchison. They face a runoff July 31 after no one in a crowded GOP field won a majority of the votes cast in last month's primary. (AP Photo/LM Otero)
U.S. Senate candidate Ted Cruz arrives for a luncheon near the state Republican convention, Friday, June 8, 2012, in Fort Worth, Texas. (Ron T. Ennis/Fort Worth Star-Telegram/MCT via Getty Images)
U.S. Senate candidate candidate Ted Cruz and his wife, Heidi, wave to delegates after he spoke on the final day of the state Republican convention at the FWCC on Saturday, June 9, 2012, in Fort Worth, Texas. (Ron T. Ennis/Fort Worth Star-Telegram/MCT via Getty Images)
FILE - In this Nov. 6, 2012 file photo, Sen.-elect Ted Cruz, R-Texas, left, smiles as he listens to campaign chief consultant Jason Johnson go over election results as they come in, in Houston. (AP Photo/David J. Phillip, File)
U.S. Senator Ted Cruz, a Republican from Texas, speaks at the Heritage Foundation in Washington, D.C., U.S., on Wednesday, Oct. 30, 2013. Cruz was scheduled to speak on the scope of treaty power in the U.S. Constitution. Photographer: Pete Marovich/Bloomberg via Getty Images
FILE - In this Dec. 13, 2014 file photo, Sen. Ted Cruz, R-Texas talks with reporters on Capitol Hill in Washington. Never mind dropping oil prices. U.S. producers are pushing harder than ever for the right to sell U.S. crude oil overseas. It might seem counterintuitive: Oil prices are as low as they have been at any point since 2009 and the height of the Great Recession. Depending on the projection, prices could drop further still with slowing economies across the world. Oil producers are playing a longer game, betting that long-term demand remains strong and new markets offer lucrative rewards for U.S. producers. (AP Photo/Lauren Victoria Burke, File)
LYNCHBURG, VA - MARCH 23: Senator Ted Cruz (R-Texas) stands on stage his his daughter, Catherine Cruz, 4, left, his wife, Heidi Cruz, and his older sister, Caroline Cruz, 6, right, after he made a speech announcing his candidacy for a presidential bid at Liberty University on Monday March 23, 2015 in Lynchburg, VA.(Photo by Matt McClain/ The Washington Post via Getty Images)
Republican presidential candidate Sen. Ted Cruz, R-Texas, speaks as he campaigns Tuesday, Dec. 22, 2015, in Nashville, Tenn. (AP Photo/Mark Zaleski)
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"You knew all the things you are saying today," Beck reiterated. "The time to do that would have been the day you pulled out, or the day you gave the speech so eloquently. Why now? What's new?"
Cruz said that "the most significant thing that changed" was the Supreme Court list Trump released on Friday, which added Utah Sen. Mike Lee, a Tea Party favorite.
"I think to me critically committed the only nominees he would consider for the court were on that list," he said. "Now that was a major shift."
Beck, running short on time, bumped a commercial break to ask Cruz if a Politico report that said he rented his email list out to Trump months before endorsing was accurate.
"Did you sell your list to Donald Trump?" Beck asked.
"Well Glenn, as you noted, you sell advertising. That's what actually funds your radio show and that's true, as far as I know, of every radio show. That's how one communicates," Cruz said.
The senator continued: "That's also true of every candidate. You don't sell your list, but you rent your list, so if someone wants to access your supporters, they pay for it. And that helps fund your effort. And like every other candidate, sure, we have rented our list out to those who wish to pay for it."
Cruz then took a swipe at Politico, calling the story Beck referenced a "hit piece" from a "left-wing rag."
"For the for the very first time I heard Ted Cruz calculate," Beck said of his interview with Cruz. "And when that happened, the whole thing fell apart for me. And it's my fault. It's my fault for believing men can actually be George Washington. It's my fault."