Texas Senator Ted Cruz, a Republican, on Monday told Iowa talk radio host Jan Mickelson that rulings striking down state bans on gay marriage threaten “our liberty.”

When Mickelson asked whether states could simply ignore a Supreme Court ruling invalidating such bans, Cruz answered “We can try” before going on to explain his proposed amendment to the U.S. Constitution.

“What I have already pledged that I will do is introduce a constitutional amendment to make absolutely clear that marriage is a question for the states. And if the citizens of the state of Iowa or the citizens of the state of Texas want to define marriage as the union of one man and one woman that the states have the constitutional authority to do so and that the federal government and unelected judges cannot set aside the democratically-elected legislature's reasonable decisions to enact and protect traditional marriage.”

Cruz said his amendment would be a “Tenth Amendment argument.”

“If the courts were following the Constitution, we shouldn't need a new amendment. But they are, as you put it quite rightly, making it up right now and it's a real danger to our liberty,” he added.