Sen. Marco RubioMarco Antonio RubioHillicon Valley: Amazon wins union election — says 'our employees made the choice' Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists The growing threat of China's lawfare MORE (R-Fla.) on Thursday night took aim at the Democratic presidential candidates, cautioning Iowa voters not to caucus for "socialist" Bernie SandersBernie SandersHillicon Valley: Amazon wins union election — says 'our employees made the choice' On The Money: Biden .5T budget proposes major hike in social programs | GOP bashes border, policing provisions Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists 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 ObamaUS raises concerns about Iran's seriousness in nuclear talks Matt Stoller calls on Biden administration to keep McKinsey away from infrastructure Obamas describe meeting Prince Philip in statement mourning his death 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 ClintonClose the avenues of foreign meddling Pelosi planned on retiring until Trump won election: report Pence autobiography coming from Simon & Schuster 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."