Sen. Ted Cruz (R-Texas) fired back on Saturday after Republican presidential front-runner Donald Trump launched a lengthy, furious tweetstorm at him.
Cruz reportedly suggested that Trump's attacks came in response to a new poll that showed him losing in a head-to-head competition with the senator.
"That has got to drive him nuts, and I imagine it sent him out of bed this morning tweeting and tweeting and tweeting," Cruz said, according to The Texas Tribune and other outlets.
Cruz then reportedly said Trump's behavior wouldn't be appropriate for a "commander in chief."
RELATED: The craziest Donald Trump tweets
Craziest Donald Trump Tweets
Ted Cruz: Donald Trump's raging tweetstorms aren't presidential
I told you @TIME Magazine would never pick me as person of the year despite being the big favorite They picked person who is ruining Germany
I would like to wish everyone, including all haters and losers (of which, sadly, there are many) a truly happy and enjoyable Memorial Day!
Just made the point at #NCGOPcon that "we have to protect our border & I think everyone here knows, nobody can build a wall like Trump!"
My twitter has become so powerful that I can actually make my enemies tell the truth.
China's Communist Party has now publicly praised Obama's reelection. They have never had it so good. Will own America soon.
While Jon Stewart is a joke, not very bright and totally overrated, some losers and haters will miss him & his dumb clown humor. Too bad!
Why is Obama playing basketball today? That is why our country is in trouble!
An 'extremely credible source' has called my office and told me that @BarackObama's birth certificate is a fraud.
Remember, I said Derek don't sell your Trump World Tower apartment...its been lucky for you. The day after he sold it, he broke his foot.
I never fall for scams. I am the only person who immediately walked out of my ‘Ali G’ interview
.@cher--I don’t wear a “rug”—it’s mine. And I promise not to talk about your massive plastic surgeries that didn’t work.
The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive.
.@katyperry is no bargain but I don't like John Mayer--he dates and tells--be careful Katy (just watch!).
.@BetteMidler talks about my hair but I'm not allowed to talk about her ugly face or body --- so I won't. Is this a double standard?
It's Thursday. How much money did Barack Obama waste today on crony green energy projects?
Truly weird Senator Rand Paul of Kentucky reminds me of a spoiled brat without a properly functioning brain. He was terrible at DEBATE!
Hey @realDonaldTrump - In case you're looking for that tweet you deleted .. I got it right here. http://t.co/a6F98q5xGU
This very expensive GLOBAL WARMING bullshit has got to stop. Our planet is freezing, record low temps,and our GW scientists are stuck in ice
Everyone knows I am right that Robert Pattinson should dump Kristen Stewart. In a couple of years, he will thank me. Be smart, Robert.
26,000 unreported sexual assults in the military-only 238 convictions. What did these geniuses expect when they put men & women together?
Sorry losers and haters, but my I.Q. is one of the highest -and you all know it! Please don't feel so stupid or insecure,it's not your fault
How amazing, the State Health Director who verified copies of Obama’s “birth certificate” died in plane crash today. All others lived
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"I think in terms of a commander in chief, we ought to have someone who isn't springing out of bed to tweet in a frantic response to the latest polls," he said. "I think the American people is looking for a commander in chief who is stable and steady and a calm hand to keep this country safe," Cruz added.
The New York Times further reported that Cruz described Trump as having a "lot of nervous energy."
"And for whatever reason, Donald doesn't react well when he's going down in the polls," he added.
Trump easily leads Cruz in national polls, but Cruz has surged in recent weeks to roughly tie Trump in polls of the February 1 Iowa caucus, the first sate to weigh in on the presidential primary.
Trump and Cruz were once campaign-trail allies, with Cruz in particular taking painstaking efforts to avoid criticizing the front-runner. But two weeks ago, Trump started questioning Cruz's eligibility to be president on a daily basis, and their détente melted away.
On Saturday morning and afternoon, Trump got especially aggressive on Twitter. For eight hours, Trump attacked Cruz for not reporting two bank loans he used to finance his 2012 Senate campaign, for being born in Canada, and for bashing Trump's "New York Values."
In one particularly provocative Twitter post, Trump posted a photo of the ruins of the September 11, 2001, terror attacks and asked if that was the same New York that Cruz was knocking.
Apparently in response to Trump, Cruz campaign spokesman Rick Tyler tweeted campaign donations that the "real Donald Trump" had given to New York Democratic politicians over the years:
The Real Donald Trump gave $14,100 to NYC liberal Charlie Rangel #NYValues
Ted Cruz: Donald Trump's raging tweetstorms aren't presidential
Texas Solicitor General R. Ted Cruz, left, and Don. R. Willett, right, leave the federal courthouse after a pre-trial hearing on Tuesday, Dec. 9, 2003, in Austin, Texas. Lawyers and federal judges met earlier to plan for the upcoming redistricting trial. Willett is deputy Attorney General for Legal Counsel. (AP Photo/Harry Cabluck)
Ted Cruz, from the Texas Attorney General's Office, speaks to members of the House Ways and Means Committee Tuesday, April 18, 2006, in Austin, Texas. Texas lawmakers embark on a 30-day special session to repair the state's method of paying for public education. Cruz explained the court rulings on school finance to the committee. (AP Photo/Harry Cabluck)
UNITED STATES - MARCH 21: Ted Cruz (R) Texas
(Photo By Douglas Graham/Roll Call)
Texas US Senate Republican primary candidate Ted Cruz, left, talks with his father Rafael Cruz as he works at the campaign's phone bank, on election day, Tuesday, May 29, 2012, in Houston. (AP Photo/Pat Sullivan)
Texas Republican Ted Cruz speaks to reporters Tuesday, May 29, 2012, in Houston. Cruz placed second behind Lt. Gov. David Dewurst in a field of nine candidates in the Republican primary race for a U.S. Senate seat. Cruz and Dewhurst will square off in a second round of voting July 31. (AP Photo/Pat Sullivan)
U.S. Senate Candidate Ted Cruz, right, has a discussion with David Dewhurst supporter Sherri Heinzman before the Texas Federation of Republican Woman luncheon during the Texas Republican Convention in Fort Worth, Texas, Friday, June 8, 2012. Cruz is competing with Dewhurst for the Republican nomination to replace retiring Sen. Kay Bailey Hutchison. They face a runoff July 31 after no one in a crowded GOP field won a majority of the votes cast in last month's primary. (AP Photo/LM Otero)
U.S. Senate candidate Ted Cruz arrives for a luncheon near the state Republican convention, Friday, June 8, 2012, in Fort Worth, Texas. (Ron T. Ennis/Fort Worth Star-Telegram/MCT via Getty Images)
U.S. Senate candidate candidate Ted Cruz and his wife, Heidi, wave to delegates after he spoke on the final day of the state Republican convention at the FWCC on Saturday, June 9, 2012, in Fort Worth, Texas. (Ron T. Ennis/Fort Worth Star-Telegram/MCT via Getty Images)
FILE - In this Nov. 6, 2012 file photo, Sen.-elect Ted Cruz, R-Texas, left, smiles as he listens to campaign chief consultant Jason Johnson go over election results as they come in, in Houston. (AP Photo/David J. Phillip, File)
U.S. Senator Ted Cruz, a Republican from Texas, speaks at the Heritage Foundation in Washington, D.C., U.S., on Wednesday, Oct. 30, 2013. Cruz was scheduled to speak on the scope of treaty power in the U.S. Constitution. Photographer: Pete Marovich/Bloomberg via Getty Images
FILE - In this Dec. 13, 2014 file photo, Sen. Ted Cruz, R-Texas talks with reporters on Capitol Hill in Washington. Never mind dropping oil prices. U.S. producers are pushing harder than ever for the right to sell U.S. crude oil overseas. It might seem counterintuitive: Oil prices are as low as they have been at any point since 2009 and the height of the Great Recession. Depending on the projection, prices could drop further still with slowing economies across the world. Oil producers are playing a longer game, betting that long-term demand remains strong and new markets offer lucrative rewards for U.S. producers. (AP Photo/Lauren Victoria Burke, File)
LYNCHBURG, VA - MARCH 23: Senator Ted Cruz (R-Texas) stands on stage his his daughter, Catherine Cruz, 4, left, his wife, Heidi Cruz, and his older sister, Caroline Cruz, 6, right, after he made a speech announcing his candidacy for a presidential bid at Liberty University on Monday March 23, 2015 in Lynchburg, VA.(Photo by Matt McClain/ The Washington Post via Getty Images)
Republican presidential candidate Sen. Ted Cruz, R-Texas, speaks as he campaigns Tuesday, Dec. 22, 2015, in Nashville, Tenn. (AP Photo/Mark Zaleski)