Donald Trump and his Republican rivals turned their Florida presidential debate into a mostly respectful, but still pointed, discussion of Islam and trade.
Mr Trump shook his head and declared to the Miami audience at one point: “I can’t believe how civil it’s been up here.”
Ted Cruz and Marco Rubio did not hesitate to lay out their differences with Mr Trump, but the candidates largely managed to present those arguments without vitriol.
In a lengthy discussion of the threat posed by radicalised Muslims, Mr Trump refused to back away from his recent statement that “Islam hates the West”, saying he would not stoop to being “politically correct” by avoiding such statements.
Mr Rubio hit back, saying: “I’m not interested in being politically correct. I’m interested in being correct.”
The Florida senator noted the Muslims in the US military and buried in Arlington National Cemetery and said the only way to solve the problem of violent extremists was to work with people Muslims who were not radicals.
Mr Cruz bundled together his criticisms of Mr Trump for what he called simplistic solutions on trade and on Islamic terrorists, saying: “The answer is not to simply yell, ‘China: bad, Muslim: bad’.”
Mr Trump, though, clearly was intent on projecting a less bombastic – and more presidential – image.
His closing message was: “Be smart and unify.”
“We’re all in this together,” he said early on, sounding more like a conciliator than a provocateur as he strives to unify the party behind his candidacy. “We’re going to come up with solutions. We’re going to find the answer to things.”
His rivals, in a desperate scramble to halt his march to the nomination, gradually ramped up their criticism as the night wore on.
Mr Rubio’s overarching message was: “I know that a lot of people find appeal in the things Donald says. The problem is presidents can’t just say anything they want because it has consequences around the world.”
Mr Cruz, eager to cement his position as the party’s last best alternative to Mr Trump, had a string of criticisms of the Republican front-runner, too, saying flatly at one point: “His solutions don’t work.”
Billionaire businessman Mr Trump refused to take the bait when Mr Cruz repeatedly jabbed at his foreign policy positions and at one point lumped him with Democrats Hillary Clinton and John Kerry in supporting the Obama administration’s Iran nuclear deal.
Mr Trump’s restrained response was: “If Ted was listening, he would have heard me say something very similar” to what Mr Cruz had said about the failings of the deal.
Mr Trump was questioned about whether he had set a tone at his rallies that fuelled violent encounters between supporters and protesters.
“I truly hope not,” he said, but added that many of his supporters have “anger that is unbelievable” about how the country is being run and that some of protesters were “bad dudes”.
US president Barack Obama, offering political commentary from the sidelines, said earlier in the day the party was going through a “Republican crack-up” that had taken on the tone of a “circus”.
He blamed the party itself for fostering the idea “that co-operation or compromise somehow is a betrayal”.
Florida is the biggest prize of Tuesday’s five-state round of voting, and all 99 of the state’s delegates will go to the winner.
In all, 367 Republican delegates will be at stake, with voting also occurring in Illinois, Missouri, North Carolina, Ohio and the Northern Mariana Islands.
In the race for delegates, Mr Trump has 459, Mr Cruz 360, Mr Rubio 152 and Ohio governor John Kasich 54. It takes 1,237 to win the Republican nomination for president.