Sen. Marco RubioMarco Antonio RubioHillicon Valley: YouTube to restore Trump's account | House-passed election bill takes aim at foreign interference | Senators introduce legislation to create international tech partnerships Senators introduce bill creating technology partnerships to compete with China DeSantis's rising GOP profile fuels 2024 talk MORE (R-Fla.) on Thursday night took aim at the Democratic presidential candidates, cautioning Iowa voters not to caucus for "socialist" Bernie SandersBernie SandersMcConnell makes failed bid to adjourn Senate after hours-long delay Senate holds longest vote in history as Democrats scramble to save relief bill Democrats break COVID-19 impasse with deal on jobless benefits 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 ObamaWhy is Joe Biden dodging the public and the press? Here's who Biden is now considering for budget chief Pentagon issues report revealing ex-White House doctor 'belittled' subordinates, violated alcohol policies 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 ClintonHillicon Valley: China implicated in Microsoft breach | White House adds Big Tech critic | QAnon unfazed after false prediction Jill Biden redefines role of first lady QAnon supporters unfazed after another false prediction 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."