Former President George W. Bush on Thursday refused to discuss his opinion on gay marriage.

During an interview with CBS This Morning host Charlie Rose, the president was asked about his one-time support for the Federal Marriage Amendment, a proposed constitutional amendment defining marriage as a heterosexual union.

“Yeah, well, I'm not, I'm not weighting in on these issues,” he replied. “As you know, because I've made the decision to get off the stage. And so I'm off the stage.”

Bush said he supported the amendment during the 2004 campaign. Later in the campaign, he reversed course slightly, saying that the states should be allowed to “enable people to, you know, be able to have rights, like others.” The comment was widely viewed as an endorsement of civil unions for gay and lesbian couples.

Activists opposed to marriage equality have renewed their calls for passage of the Federal Marriage Amendment.

As recently as last month, Brian Brown, president of the National Organization for Marriage (NOM), the nation's most vociferous opponent of marriage equality, vowed to take his case to Congress if the Supreme Court ruled in favor of supporters in two cases related to same-sex marriage.