Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) slammed Sen. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP 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.

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.