Sen. Marco RubioMarco RubioRubio brushes off demonstrator asking about town halls A guide to the committees: Senate Schumer: GOP will break from Trump within months MORE (R-Fla.) on Thursday night took aim at the Democratic presidential candidates, cautioning Iowa voters not to caucus for "socialist" Bernie SandersBernie SandersDeVos: 'My job isn’t to win a popularity contest with the media' DNC candidate Harrison drops out, backs Perez for chairman The Hill's 12:30 Report 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 ObamaGovernor: NY will protect transgender students Poll: Majority of voters oppose border wall, ObamaCare repeal Muslim White House staffer quits, slamming Trump’s travel ban 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 Rodham ClintonDems worry too much about upsetting others. That needs to stop. New York Knicks owner gave 0K to pro-Trump group Beyoncé voices support for LGBT students after Trump transgender order 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."