If Trump were to clinch the nomination, Cruz believes the billionaire would "probably" lose to Clinton.
"There is no doubt that if Donald steam rolls through Super Tuesday, wins everywhere with big margins, that he may well be unstoppable", Cruz said on CBS's "Face the Nation".
When Christie was a candidate for the Republican nomination, he rejected Trump's proposals to build a border wall and ban Muslims and ridiculed Trump's position that Social Security reforms are unnecessary.
Cruz and Rubio are looking ahead to Tuesday's primary contests differently. Marco Rubio of Florida and Ted Cruz of Texas - will get a share of them as well. But, Cruz said, he would support whoever becomes the party's nominee, "Period".
The tax documents Rubio has released are not complete tax filings, as Mitt Romney provided in 2012 and Hillary Clinton produced past year.
Rubio released his tax returns Saturday.
But Rubio said Saturday he expects to win the nomination outright.
"I think Donald Trump's the best guy, and I'm not an on-the-sidelines guy".
Four presidential candidates. AJC graphic.
"A disqualifying & disgusting response by @realDonaldTrump to the KKK". "Donald Trump likes to sue people".
The sheer scale of the battlefield favors Trump, whose ubiquitous media profile means he is known everywhere, and Clinton, whose decades in public life give her an advantage over the lesser-known Sanders.
"I think there are many out there who are rooting for that outcome so that he's the nominee, and you can see it in the coverage he's gotten", he said.
Ted Cruz, meanwhile, said it's "unfortunate" that Trump won't condemn former Ku Klux Klan leader David Duke, and said a white supremacist group is making robo-calls urging people, "Don't vote for the Cubans in the race".
Rubio's returns show his family's adjusted gross income was $335,561 in 2014, the most recent year he made available.
Rubio vows to at least win Florida and keep going. But a Cruz win in Texas would present a significant road block. On the Democratic side, Clinton is leading Sanders 544 delegates to 85. "I am very encouraged where we are in Georgia and where we are all across the country ... all across Super Tuesday". It must be kept in mind that at stake on Super Tuesday are 595 delegates in 11 states.
That's why it's crucial for him to hold his own on Super Tuesday.
In Tennessee, Trump leads Cruz by 18 points, 40 percent to 22 percent, while Rubio gets 19 percent, Carson 9 percent and Kasich at 6 percent.
In an interview with Chris Wallace on "Fox News Sunday", Trump repeated that he would not release his tax returns right now.
The Florida senator, who has tussled with the billionaire since Thursday's CNN Republican debate, joined the #NeverTrump movement on Twitter.
Clinton is favored in most of the states voting Tuesday, but the Sanders campaign said it has a good shot at winning five of the states, especially ones outside of the southern states where black voters favoring Clinton comprise a large part of the Democratic electorate.
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