Wisconsin Gov. Scott Walker, a likely 2016 GOP presidential candidate, said Sunday he supports a constitutional amendment that would allow states to ban same-sex marriage.

Appearing on ABC’s “This Week,” Walker said, “I personally believe that marriage is between one man and one woman,” in response to a question about the upcoming Supreme Court decision on same-sex marriage.

“If the court decides that, the only next approach is for those who are supporters of marriage being defined as between one man and one woman is ultimately to consider pursuing a constitutional amendment.”

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Walker, who has said he will announce a decision on a run for the White House by the end of the summer, had previously supported a 2006 Wisconsin’s constitutional amendment to ban same-sex marriage, but a federal judge declared the law unconstitutional last year.