Rubio spokesman: Report about dropping out '100 percent false'
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Sen. Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE's (R-Fla.) campaign is pushing back on a report that some advisers want him to drop out of the presidential race before his home state primary on March 15.

Alex Conant, Rubio's communications director, called the report “100 percent false.” 

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“That is fiction,” Conant told CNN on Monday night. “I was sitting in a senior staff meeting planning out next week’s schedule when I saw this report suddenly air, and I came racing across town to correct it.” 

He continued his attack in a fundraising email, writing, "They carried the story as breaking news, live, on air, without speaking with a single person on our campaign. That’s complete malpractice."

Sen. Jim RischJames (Jim) Elroy RischSenate approves Trump's debt deal with Democrats Overnight Cybersecurity: Mueller impanels grand jury in Russia probe | Researcher who helped stop WannaCry attack detained | Audit finds OPM systems still at risk Overnight Finance: Trump signs Russia sanctions bill, rips Congress | Trump plan would cut legal immigration | Senate confirms labor board pick | House Budget chair running for governor | Regulator takes step to change 'Volcker Rule' MORE (R-Idaho), a Rubio supporter, continued to try to debunk the report on “CNN Out Front" Monday evening

"I sat at the table with advisers, including the senior advisers to the campaign. I can tell you there was not even a hint that that was the issue,” Risch said. “Indeed we had deep and lengthy discussions about Florida, the strategy there, how they're going forward in Florida.”

He continued: “To repeat a rumor like this without foundation and naming the person who is supposed to be putting this out really just isn't fair, because these rumors get started and people repeat them."

Conant later accused CNN of cancelling an 8 p.m. appearance he was set to make. 

CNN on Monday reported there is a debate raging within the Rubio camp about whether he has any chance of winning the Florida primary. 

“He doesn’t want to get killed in his home state,” one source familiar with the discussions told CNN. “A poor showing would be a risk and hurt his political future.” 

The sources told CNN they are fearful that Rubio's campaign will take another hit on Tuesday, when he might fare poorly in the GOP contests in Michigan, Mississippi, Idaho and Hawaii.

"CNN had multiple sources on this reporting, and we stand by it 100 percent," the network said in a statement late Monday.

In dismissing the report, Conant cited Rubio’s recent poll numbers in Florida. 

A new Monmouth University poll released Monday found Rubio trailing Donald TrumpDonald John TrumpBiden slams Trump over golf gif hitting Clinton Trump Jr. declines further Secret Service protection: report Report: Mueller warned Manafort to expect an indictment MORE by only 8 points in the state. Earlier polls showed Trump with a double-digit lead.

Florida is one of the biggest contests on the primary calendar. Aside from being one of the most important battleground states in the country, its 99 Republican delegates are winner-take-all.

Rubio remains "bullish" about his chances in the state, according to the CNN report.

--This report was updated on March 8 at 11:20 a.m.