SALT LAKE CITY — In an extraordinary display of Republican chaos, the party's most recent presidential nominees, Mitt Romney and John McCain, lambasted current front-runner Donald Trump on Thursday, calling him unfit for office and a danger for the nation and the GOP.
"His is not the temperament of a stable, thoughtful leader," Romney declared. He called Trump "a phony" who is "playing the American public for suckers," a man whose "imagination must not be married to real power."
The vicious feud marked a near-unprecedented scenario pitting the Republican Party's most prominent leaders, past and present, against each other as Democrats begin to unite around Hillary Clinton.
The criticism set the tone for a primetime debate in which Trump lashed back, calling Romney "a failed candidate" who lost to Barack Obama four years ago because he was such a poor candidate. The loss, Trump charged, was "an embarrassment."
And yet, in reply to the last question of Thursday night's debate, each of the remaining candidates — Ted Cruz, Marco Rubio and John Kasich — said they would support Trump if he was the presidential nominee of their party.
Underlying the clash is a bleak reality for panicking Republican officials: Beyond harsh words, there is little they see to stop Trump's march toward the presidential nomination. Party leaders are poring over complicated delegate math, outlining hazy scenarios for a contested national convention and even flirting with the idea of a third-party effort.
Romney confidant Ron Kaufman, a senior member of the Republican National Committee, openly embraced the possibility of a contested convention: "If that's the only way to stop Trump, it makes sense," he told The Associated Press.
In the most notable verbal attacks against Trump to date, Romney and his 2012 running mate, House Speaker Paul Ryan, urged voters in the strongest terms to shun the former reality television star for the good of country and party.