Paul slams Rubio's visa waiver vote, saying rival prefers 'open borders'
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Sen. Rand PaulRandal (Rand) Howard PaulCongress must end American support for Saudi war in Yemen Black men get longer prison sentences than white men for same crimes: study Sarah Palin on sexual harassment: 'People know I'm probably packing' so they 'don't mess with me' MORE (R-Ky.) slammed Sen. Marco RubioMarco Antonio RubioCongress faces growing health care crisis in Puerto Rico The Hill's 12:30 Report Colbert mocks Trump for sipping water during speech on Asia trip MORE Friday, suggesting that the Florida Republican's opposition to a proposal cracking down on visas is the latest example of where he's wrong on national security.

"The first job of the President should be to secure our borders and fix broken refugee and visa systems to stop terrorists," Paul, a GOP presidential candidate, said during a string of tweets aimed at the Florida Republican, also a 2016 candidate. "Yesterday I introduced my SECURE bill as an amendment in the Senate, to protect our borders and resources. Marco Rubio voted no."
 
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The Kentucky Republican tried to attach a proposal that would pause visas for almost 40 countries to the ObamaCare repeal bill passed by the Senate on Thursday evening. The proposal would also require individuals who are from Visa Waiver Program countries to wait 30 days before entering the country.
 
He ultimately fell short, with only 10 Republicans — including himself and another presidential candidate, Sen. Ted CruzRafael (Ted) Edward CruzTexas Republicans slam White House over disaster relief request Dem rep: Trump disaster aid request is 'how you let America down again' Moore endorsements disappear from campaign website MORE (R-Texas) — voting for the amendment, which would have also required additional screening for any admitted refugees. 
 
Even if the amendment had been added to the legislation, it stood little chance of becoming law with President Obama expected to veto the repeal legislation. 
 
Paul, however, suggested on Friday that Rubio's "no" vote was the latest example of where he believes the Florida Republican — dating back to his time in the state legislature — has been wrong on national security issues. 
 
 
The tweets aren't the first time the two senators have clashed on foreign policy issues, where Paul's libertarian views frequently put him at odds with Rubio's hawkish stances. 
 
The two have repeatedly traded barbs over a myriad of national security topics including government surveillance — where they were on opposite sides during a Senate debate earlier this year, how to confront Russian President Vladimir Putin and if a no-fly zone is needed in Syria. 
 
The Kentucky Republican stepped up the rhetorical battle earlier this week when he suggested that Rubio's foreign policy stances are similar to former Secretary of State Hillary ClintonHillary Diane Rodham ClintonO’Malley tells Dems not to fear Trump FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Pelosi blasts California Republicans for supporting tax bill MORE, who is the front-runner for the Democratic presidential nomination. 
 
Contrasting himself with the "Clinton/Rubio foreign policy," Paul wrote in a Time magazine op-ed, "I hope voters will seek out a leader who will learn from history and not pursue a reckless policy."