Sen. Marco RubioMarco Antonio RubioThe Memo: 'Whistleblower' furor gains steam Liberal super PAC launches browser extension replacing 'Mitch McConnell' with 'Moscow Mitch' Trump faces difficult balancing act with reelection campaign MORE (R-Fla.) says spending cuts to defense are “unsustainable,” “dangerous” and “reckless” given the instability of the current geopolitical climate.

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“We need to get back to funding our defenses because it is the most important thing the federal government does,” Rubio said on Fox Business’s “Mornings with Maria” on Sunday.

The Florida senator, who’s running for president, said welfare programs such as Medicare and Social Security are the main drivers of an $18.5 trillion national debt.

“Defense spending is not the reason why we have a debt. It’s not the driver of our national debt,” Rubio said. “Our national debt, especially long-term, is driven by mandatory spending programs that need to be reformed.”

Experts estimate Rubio’s plan to boost defense spending could cost upwards of $1 trillion over 10 years.

Rubio also called Russian President Vladimir Putin a “gangster” and said the international community needs to reinvigorate NATO to curb his expansionist military agenda.

“He’s a gangster, but he’s a rational, cost-benefit analysis guy,” Rubio said. “He makes decisions based on geopolitical realities, and in the case of Europe, the benefits of what he’s doing in Europe outweigh the costs that Russia now is bearing militarily as a result.”