Watch full video of the Republican debate hosted by FOX News

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DES MOINES, IA  — Ted Cruz opened the final Republican presidential debate before the Iowa caucuses Thursday by answering a question from Fox News moderators about “the elephant not in the room” — Donald Trump.

“Let me say, I’m a maniac,” the Texas senator said in response to Megyn Kelly, channeling Trump’s barbs. “And everyone on this stage is stupid, fat and ugly and Ben, you’re a terrible surgeon. Now that we’ve gotten the Donald Trump portion out of the way…”

Marco Rubio said the 2016 presidential campaign is “not about Donald Trump.”

“He’s an entertaining guy, he’s the greatest show on earth,” the Florida senator said, adding that the focus should be on preventing Hillary Clinton from getting to the White House.

Jeb Bush, who has been increasingly combative with Trump during the debates, joked that he wished Trump was there. He appeared to take a swipe at his rivals on stage for not taking on Trump as aggressively as he has.

“I kind of miss Donald Trump. He was a little teddy bear to me,” Bush said. “Everybody else was in the witness protection program when I went after him.”

Unexpected curveball

Cruz, Bush and Rubio were joined on the debate stage by Ben Carson, Chris Christie, John Kasich and Rand Paul.

Trump, the GOP presidential front-runner, threw an unexpected curveball into the 2016 campaign this week when he declared that he would boycott the debate amid an escalating feud with Fox News. As his rivals stepped onto the debate stage, Trump supporters were gathered less than three miles away at Drake University, where the billionaire businessman was hosting a rival event billed as benefiting veterans.

In an interview with CNN’s Brianna Keilar on Thursday, Trump said Fox News “apologized” to him for a mocking statement the television network issued two days before the debate.

Trump said that while the network “could not have been nicer” as it tried to woo him back into attending the debate, he would stick to his plan of holding the event for veterans.

“I was treated very unfairly by Fox. Since then they’ve been excellent, they’ve been very nice, but it’s too late,” he said in the interview aboard his private plane.

Trump likened his decision to skip the debate to how he would lead the country as president of the United States.

“I wanted to fight for myself just like I’ll fight for the country,” Trump said. “You have to stick up for yourself, you have to fight for yourself and you have to fight for your country.”

A Fox News spokesperson said Roger Ailes, the network’s chief executive, had “three brief conversations” with Trump on Thursday.

“In the course of those conversations, we acknowledged his concerns about a satirical observation we made in order to quell the attacks on Megyn Kelly, and prevent her from being smeared any further,” the spokesperson said. “Furthermore, Trump offered to appear at the debate upon the condition that FOX News contribute $5 million to his charities. We explained that was not possible and we could not engage in a quid pro quo, nor could any money change hands for any reason.”

The spokesperson went on: “In the last 48 hours, we’ve kept two issues at the forefront — we would never compromise our journalistic standards and we would always stand by our journalist, Megyn Kelly. We have accomplished those two goals and we are pleased with the outcome. We’re very proud to have her on stage as a debate moderator alongside Bret Baier & Chris Wallace.”

Debating without Trump

Thursday marked the first time that Trump’s rivals found out what it’s like to debate without his bluster and theatrics dominating the stage. The stakes were highest for Cruz, Trump’s closest rival here in the Hawkeye State. The two, who have spent the last week slinging a flurry of political attacks at one another, are battling to finish first in Iowa on Monday.

In Trump’s absence, sparks flew between the candidates on the issue of immigration.

Rubio, who co-sponsored the so-called “Gang of Eight” bipartisan immigration reform bill, was on the defensive on one of his most vulnerable issues.

“I do not support blanket amnesty,” he said.

Bush turned to his fellow Floridian and said he was “confused” to hear Rubio say this, before accusing the senator of changing his position for political expediency.

“He cut and run because it wasn’t popular among conservatives, I guess,” Bush said.

Cruz defended his conservative credentials, saying an amendment he had proposed during the Senate’s immigration debate made clear that “anyone here illegally is permanently ineligible for citizenship.”

“My friend Sen. Rubio stood with Barack Obama, Harry Reid and Chuck Schumer” and supported amnesty, Cruz said.

Paul jumped in by calling Cruz’s statements on immigration “insulting” and said Cruz had no place accusing his rivals of being for amnesty.

Rubio was quick to join in.

“This is the lie that Ted’s campaign is built on,” Rubio said. “He’s the most conservative guy and everyone else is a ‘RINO.'”

Christie, however, delivered one of the strongest performances of the immigration exchange, casting Cruz and Rubio and products of Washington making procedural arguments that don’t resonate with voters.

“This is why you need to send someone from outside of Washington to Washington,” the New Jersey governor said. “I feel like I need a Washington-to-English converter.”

Undercard

Trump was even a presence at an earlier undercard debate featuring four lower-polling candidates — Carly Fiorina, Mike Huckabee, Rick Santorum and Jim Gilmore. Santorum quickly expressed deep frustration with the drama surrounding Trump.

“The entire lead-up to this debate was about whether Donald Trump was going to show up to the next debate,” Santorum said. “The people of Iowa … care a lot about the issues. They care about who’s going to be the leader of the free world.”

Santorum and Huckabee, two previous winners of the Iowa caucuses, attended Trump’s veterans event after the debate.

Gilmore, who has not qualified for most undercard debates, mocked Trump’s rival event, as he called himself “the only veteran” running for president this cycle.

“I’m not going to any Donald Trump event over across town on some sort of faux veteran sort of issue,” Gilmore said.

He appeared to relish his time in the spotlight, taking issue on several occasions with how many questions he was being asked by the moderators.

“Did you miss me? Did you skip me?” Gilmore blurted out when a question went to Huckabee.