O'Reilly joined the chorus of voices slamming the Republican      from Kentucky on Tuesday for his comments that vaccines should not be mandatory and took      the chance to take another swipe at the libertarian-leaning      senator's foreign policy, calling him "perhaps the most      controversial candidate in the race."    
      "That's not unusual for me disagreeing with Mr. Paul,"      O'Reilly said.    
      The conservative host also called Paul's stance on terrorism      and Iran "nave," reprising previous comments that Paul's      foreign policy views would hurt him in an eventual GOP      primary.    
      Paul opposes the GOP-led effort to impose additional      sanctions on Iran in an attempt to pressure the Iranians to      give up their nuclear program.    
      "Sen. Paul loses traction because he has no plan to defeat      the jihad and he comes across, maybe he's not that way, it      comes across as kind of let them do what they want to do as      long as they're not in the U.S.A.," O'Reilly said Tuesday.    
      Paul declined to appear on the show Tuesday, O'Reilly said,      adding to a string of refusals to appear on the program      apparently stemming from O'Reilly's criticism of the      senator's foreign policy views.    
      O'Reilly attacked Paul last summer for flipping his position      on Israel and denying that he ever wanted to cut foreign aid      to Israel. Paul has beefed up his support for Israel and      shied away from his isolationist foreign policy views as he      began seriously considering a presidential run.    
      "Rand Paul is going to be hurt by his foreign policy,"      O'Reilly said during a previous show.    
      O'Reilly also suggested that Paul's father, former Republican      presidential candidate Ron Paul, is becoming "increasingly      radical."    
      Graham rebukes Paul on vaccines    
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