Republican presidential candidate Ben Carson said Wednesday that the Supreme Court's June ruling striking down gay marriage bans nationwide is the worst decision by the high court in the last 20 years.

Carson, who is polling a close second behind businessman Donald Trump among Republicans, made the remark during a Q&A segment with TheBlaze's Glenn Beck.

“Worst Supreme Court decision in the last 20 years?” Beck asked.

“Probably, I would say, the gay marriage decision,” the former neurosurgeon answered.

When asked who he would appoint to the Supreme Court, Carson declined to offer up any specifics.

In an interview earlier this month, Carson told conservative radio host Eric Metaxas that allowing gay couples to marry would lead to plural marriages.

(Related: Ben Carson: Gay marriage “negates the word of God.”)