Sen. Marco RubioMarco Antonio RubioNikki Haley: New York Times ‘knew the facts’ about curtains and still released story March For Our Lives founder leaves group, says he regrets trying to 'embarrass' Rubio Rubio unloads on Turkish chef for 'feasting' Venezuela's Maduro: 'I got pissed' MORE (R-Fla.) on Thursday night took aim at the Democratic presidential candidates, cautioning Iowa voters not to caucus for "socialist" Bernie SandersBernard (Bernie) SandersFive takeaways from Cruz, O'Rourke's fiery first debate Ben & Jerry’s co-founders announce effort to help 7 Dem House challengers Dems look to Gillum, Abrams for pathway to victory in tough states MORE

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"You will be the first Americans to get to answer the fundamental question about what comes next for this country after seven disastrous years of Barack ObamaBarack Hussein ObamaThe Hill's 12:30 Report — Trump questions Kavanaugh accuser's account | Accuser may testify Thursday | Midterm blame game begins Dems look to Gillum, Abrams for pathway to victory in tough states Ford taps Obama, Clinton alum to navigate Senate hearing MORE. And let me tell you what the answer better not be. It better not be Bernie Sanders," the White House hopeful said during Fox News's GOP debate in Iowa.
 
"Bernie Sanders is a socialist. I think Bernie Sanders is a good candidate for president — of Sweden," Rubio said to laughter, a line he has repeated on the campaign trail of late. 
 
"We don't want to be Sweden, we want to be the United States of America," he added.
 
The Florida senator then turned his attention to Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonPompeo: 'We've not been successful' in changing US-Russia relations Michael Moore ties Obama to Trump's win in Michigan in 2016 The Memo: Could Kavanaugh furor spark another ‘year of the woman’? MORE, calling her a "liar" over the 2012 attack in Benghazi and chiding her about the controversy over her private email server while serving as secretary of State. 
 
"And Hilary Clinton is disqualified from being the commander in chief of the United States. In fact, one of her first acts as president may very well be to pardon herself," Rubio said.
 
"And Hillary Clinton lied to those four brave Americans who lost their life in Benghazi," he continued. "And anybody who lies to the families of Americans who have died in the service of this country can never be commander in chief of the United States."