Sen. Rand Paul (R-KY) is criticizing the decision by President Donald Trump to launch missile strikes on a Syrian air base without approval from Congress.

In a Fox News op-ed, Paul wrote that "no matter your view of the merits of engaging in Syria, every member of Congress should stand up today and reclaim our Constitutional authority over war."

Paul joined Stuart Varney today on Fox Business Network, emphasizing that the Founding Fathers believed war should be fully debated by Congress. 

"What we're doing now is illegal and unconstitutional and the ramifications could be extreme. They may not, but there is a great danger in bumping up against another nuclear power," said Paul, referring to Russia and a new report that a Russian warship entered the eastern Mediterranean where two U.S. Navy ships launched the missiles Thursday.

Paul said under the Constitution, the president can only act unilaterally when the nation is attacked or to prevent an imminent attack. 

Watch the interview above and let us know your thoughts.

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