Sen. Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE (Fla.) slammed his colleague Sen. Rand PaulRandal (Rand) Howard PaulSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Lawmakers grapple with warrantless wiretapping program MORE (Ky.) as a “committed isolationist” as the pair sparred over taxes in the fourth GOP presidential debate Tuesday.

“Is it conservative to have a trillion dollars in transfer payments, a new welfare program, that's a refundable tax credit?” Paul said of Rubio's tax plan.

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“Add that to Marco's plan for $1 trillion in new military spending and you get something that looks to me not very conservative,” Paul said. 

Rubio, who has been rising toward the top of the crowded GOP field, defended his tax plan before pivoting to a desire to “rebuild the American military.”

“I know that Rand is a committed isolationist. I am not,” Rubio said. “I know the world is a safer and better place when America is the strongest military power in the world.”

Paul, the most libertarian-leaning candidate in the 15-person GOP field, has maintained a non-interventionist position on foreign policy, an issue where Rubio is among the most hawkish.

“Marco, Marco, how is it conservative ... to add a trillion dollars in military expenditures?” Paul asked. 

“You cannot be a conservative if you're going to keep promoting new programs that you're not going to pay for,” he added to applause. 

“We cannot even have an economy if we're not safe,” Rubio responded, mentioning threats from Islamic militants and Chinese aggression in the South China Sea. 

“The world is a stronger and better place when the United States is the strongest military power in the world,” Rubio said to roaring applause. 

Paul did not relent on the issue, interjecting, “I do not think we are any safer from bankruptcy court. As we go further and further into debt, we become less and less safe.”