The Obama administration has suggested using an executive order to bypass Congress if it can't get the gun control measures it wants.
Sen. Rand Paul, R-Ky., told CBN News that members of Congress are prepared to fight such an order.
"I'm against having a king," Paul said. "I think having a monarch is what we fought the American Revolution over and someone who wants to bypass the Constitution, bypass Congress--that's someone who wants to act like a king or a monarch."
"I've been opposed to executive orders, even with Republican presidents. But one that wants to infringe on the Second Amendment, we will fight tooth and nail," he continued.
"And I promise you, there'll be no rock left unturned as far as trying to stop him from usurping the Constitution, running roughshod over Congress," he vowed. "And you will see one heck of a debate if he decides to try to do this."