Senator Rand Paul called out Senator Marco Rubio at the Republican presidential candidates debate tonight, attacking his tax plan and his desire to spend more on the military as “not very conservative.”

Rubio was quick to hit back on the issue of Pentagon spending.

“I know that Rand is a committed isolationist. I’m not,” he said. “I believe the world is a stronger and better place when the United States is the strongest military power in the world.”

“You cannot be a conservative if you’re going to keep promoting new programs that you’re not going to pay for,” Paul retorted.

Rubio responded by listing a litany of dangers around the world and repeating that he wanted the United States to be “the strongest military power in the world.”

“I want a strong national defense but I don’t want us to be bankrupt,” Paul rejoined.