ted cruz donald trump fraud twitter nuke denmark SOT_00001503.jpg
PHOTO: CNN
ted cruz donald trump fraud twitter nuke denmark SOT_00001503.jpg
Now playing
01:08
Ted Cruz: My kids are 'better behaved' than Trump
PHOTO: Twitter / @smashracismdc
Now playing
01:50
Cruz swarmed by protesters at DC restaurant
ted cruz beto o'rourke split
PHOTO: Pool
ted cruz beto o'rourke split
Now playing
02:55
Ted Cruz, Beto O'Rourke spar in first debate
Senator Ted Cruz at a debate in Dallas, Texas.
PHOTO: Pool
Senator Ted Cruz at a debate in Dallas, Texas.
Now playing
01:20
Ted Cruz: Americans are 'Dreamers' also
BOONE, IA - JANUARY 4:   Republican presidential candidate U.S. Sen. Ted Cruz (R-TX) visits King's Christian Bookstore on January 4, 2016 in Boone, Iowa. Cruz began a six-day bus tour of Iowa ahead of the state's February 1, caucuses.  (Photo by Aaron P. Bernstein/Getty Images)
PHOTO: Aaron P. Bernstein/Getty Images North America/Getty Images
BOONE, IA - JANUARY 4: Republican presidential candidate U.S. Sen. Ted Cruz (R-TX) visits King's Christian Bookstore on January 4, 2016 in Boone, Iowa. Cruz began a six-day bus tour of Iowa ahead of the state's February 1, caucuses. (Photo by Aaron P. Bernstein/Getty Images)
Now playing
02:06
Ted Cruz speechless for 18 seconds after question
Facebook CEO Mark Zuckerberg arrives to testify before a joint hearing of the Commerce and Judiciary Committees on Capitol Hill in Washington, Tuesday, April 10, 2018, about the use of Facebook data to target American voters in the 2016 election. (AP Photo/Pablo Martinez Monsivais)
PHOTO: Pablo Martinez Monsivais/AP
Facebook CEO Mark Zuckerberg arrives to testify before a joint hearing of the Commerce and Judiciary Committees on Capitol Hill in Washington, Tuesday, April 10, 2018, about the use of Facebook data to target American voters in the 2016 election. (AP Photo/Pablo Martinez Monsivais)
Now playing
02:22
Cruz presses Zuckerberg on Facebook politics
Cuomo Cruz Split
Cuomo Cruz Split
Now playing
02:49
Cuomo presses Ted Cruz on his name change
ted cruz cpac gun sot _00000000.jpg
ted cruz cpac gun sot _00000000.jpg
Now playing
01:00
Ted Cruz: We should target criminals
ted cruz comments on 2013 shut down sot  _00001621.jpg
PHOTO: CNN
ted cruz comments on 2013 shut down sot _00001621.jpg
Now playing
01:40
Cruz: I have consistently opposed shutdowns
PHOTO: CNN
Now playing
00:55
Cruz: Grief after shooting staggers the mind
PHOTO: CNN
Now playing
01:37
Ted Cruz on the porn tweet: 'It was not me'
WASHINGTON, DC - MARCH 20:  U.S. Sen. Ted Cruz (R-TX) speaks during the first day of the Supreme Court confirmation hearing for Judge Neil Gorsuch before the Senate Judiciary Committee in the Hart Senate Office Building on Capitol Hill March 20, 2017 in Washington, DC.
PHOTO: Justin Sullivan/Getty Images
WASHINGTON, DC - MARCH 20: U.S. Sen. Ted Cruz (R-TX) speaks during the first day of the Supreme Court confirmation hearing for Judge Neil Gorsuch before the Senate Judiciary Committee in the Hart Senate Office Building on Capitol Hill March 20, 2017 in Washington, DC.
Now playing
01:39
Ted Cruz on health care: The math is simple
ted cruz sex toys dana bash intv sot_00003507.jpg
ted cruz sex toys dana bash intv sot_00003507.jpg
Now playing
01:13
Ted Cruz: The left seems obsessed with sex
PHOTO: CNN
Now playing
00:51
Porn video 'like' removed from Cruz's Twitter
cruz health care sot
PHOTO: CNN
cruz health care sot
Now playing
01:15
Cruz: Senators will face tough questions
ac zeleny who is ted cruz_00005407.jpg
ac zeleny who is ted cruz_00005407.jpg
Now playing
03:09
Who is Ted Cruz?

Story highlights

"We need a commander in chief, not a Twitterer in chief," Cruz told reporters

Cruz then added that Trump's tweets on Wednesday morning

(CNN) —  

Ted Cruz lashed into Donald Trump here on Wednesday for nearly 10 minutes, saying he’s a sore loser and a temperamental man who was behaving more immaturely than Cruz’s grade-school children.

“We need a commander in chief, not a Twitterer in chief,” Cruz told reporters, dubbing his rival’s outbursts on social media as “Trumper-tantrums.” “Donald’s insults get more and more hysterical the more and more upset he gets.”

Cruz added, “We’re liable to wake up one morning, and Donald, if he were president, would have nuked Denmark.”

Trump on Wednesday morning charged that Cruz “stole” his victory in Iowa by sending out controversial campaign mailers and using a CNN report to claim that Ben Carson had dropped out of the race when, in fact, the report said Carson was only heading to Florida for a quick break and to pick up clothes.

Cruz, reacting hours later to Trump’s calls for an entirely new election in Iowa, added that Trump’s tweets on Wednesday morning showed no more maturity than Cruz’s two young daughters, aged 5 and 7.

“Caroline and Catherine are better behaved,” the presidential candidate told reporters, adding that Trump was “losing it.”

And he challenged Trump again to a one-on-one debate in the coming days, saying that his win in Iowa had shown he was now clearly on Trump’s level and stature in the GOP field.

Cruz repeatedly raised the prospect that Trump could decide to skip the next GOP debates in South Carolina and in New Hampshire because he found them “stupid,” a term the real-estate magnate once memorably used to describe Iowans attracted to Carson’s campaign.