Sen. Marco RubioMarco Antonio RubioSenate moving ahead with border bill, despite Trump Hillicon Valley: New FTC chief eyes shake up of tech regulation | Lawmakers target Google, Huawei partnership | Microsoft employees voice anger over ICE contract Lawmakers urge Google to drop partnership with Chinese phone maker Huawei MORE (R-Fla.) on Thursday night took aim at the Democratic presidential candidates, cautioning Iowa voters not to caucus for "socialist" Bernie SandersBernard (Bernie) SandersDemocrats protest Trump's immigration policy from Senate floor Trump's America fights back The Hill's Morning Report — Sponsored by PhRMA — GOP lawmakers race to find an immigration fix 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 ObamaObama: Are we a nation that rips families apart? Another chance to seek the return of fiscal sanity to the halls of Congress Colombia’s new leader has a tough road ahead, and Obama holdovers aren't helping 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 ClintonTrump mocks 'elites' at campaign rally Trump backs down in rare reversal Election Countdown: Family separation policy may haunt GOP in November | Why Republican candidates are bracing for surprises | House Dems rake in record May haul | 'Dumpster fire' ad goes viral 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."