DES MOINES, Iowa — Absent Donald Trump, the Republican presidential candidates strained to take advantage of a rare opportunity to step out of the front-runner's shadow in Thursday night's debate — a staid, policy-heavy contest that offered a glimpse of what the GOP contest might have been without the unpredictable businessman.
Still, the candidates couldn't resist mocking Trump for boycotting the final debate before Iowa kicks off voting in the 2016 campaign on Monday.
Texas Sen. Ted Cruz, who is locked in a tight contest with Trump in Iowa, opened the debate with a sarcastic impression of the real estate mogul's frequent insults of his opponents.
"I'm a maniac and everyone on this stage is stupid, fat and ugly," Cruz said. Then he thanked his fellow candidates for showing Iowa voters respect by showing up.
Former Florida Gov. Jeb Bush, a frequent target of Trump, said with a wry smile, "I kind of miss Donald Trump; he was a teddy bear to me."
"When you're treated badly, you have to stick up for your rights," Trump said in explaining he was skipping the debate because he felt Fox News had dealt with him unfairly. Broadening his point, he said, "We have to stick up for ourselves as people and we have to stick up for our country if we're being mistreated."
Trump's absence put the spotlight on Cruz, who is challenging for the lead in Iowa, as well as on Florida Sen. Marco Rubio, who needs a strong showing in the state to stay competitive.
The two senators engaged in a lengthy debate on immigration, one of the most contentious issues among Republicans. Both have been accused of shifting their stances on legalizing some of those in the United States illegally, a position opposed by many GOP voters.
Cruz accused Rubio of making a "politically advantageous" decision to support a 2013 Senate bill that included a pathway to citizenship, while the Florida senator said his rival was "willing to say or do anything to get votes."
In a rare standout debate moment for Bush, the former Florida governor sharply sided with Cruz in accusing Rubio of having "cut and run" on the Senate immigration bill.
"He cut and ran because it wasn't popular with conservatives," Bush said.
Rubio struck an aggressive posture, pledging that as president he would go after terrorists "wherever they are. And if we capture them alive, we're sending them to Guantanamo." Rubio also stood by his previous calls for shutting down mosques in the U.S if there were indications that the Muslim religious centers were being used to radicalize terrorists.
"She is not qualified to be president of the United States," New Jersey Gov. Chris Christie said. "What we need is someone on that stage who has been tested who has been through it."
Asked whether the crowded establishment lane was putting Trump in position to be the nominee, Bush said, "We're just starting out. The first vote hasn't been counted. Why don't we let the process work?"
"It's called politics," Bush said. "That's the way it is. I'm running hard."
Trump pulled out of the debate this week, citing unfair treatment from host Fox News. He's feuded with the network for months, particularly anchor and debate moderator Megyn Kelly.
It's unclear whether Trump's unusual move will hurt his standing with Iowa voters. But his absence did give his rivals more time to make their case to voters.