There’s also consternation about a group of mainstream GOP donors, including New York City billionaire Paul Singer, who are bankrolling American Unity Fund, an organization devoted to moderating the GOP’s official position on same-sex marriage. The outfit has spent months courting delegates on the platform committee, hoping to convince them that greater flexibility on the issue will help the party expand. Last month, American Unity Fund officials traveled to Hollywood, Florida, to attend the RNC’s annual spring meeting.

The pro-gay marriage group is facing long odds. Convention delegates are typically conservative, and in past years they’ve come out sharply against same-sex marriage. In 2012, the convention expressed its support for a constitutional amendment defining marriage as a union of one man and one woman. It rebuked what it called “the court-ordered redefinition of marriage” as “an assault on the foundations of our society.”

But conservatives are sounding the alarm. Over the weekend, Family Research Council President Tony Perkins, a Louisiana delegate who will have a seat on the Platform Committee, sent an email to supporters in which he derided Singer as a “sexual revolutionary” bent on “hijacking” and “radicalizing” the platform. The message was sent under the subject line, “New stealth attack threatens natural marriage.”

In a separate letter, Perkins called the platform “a true test” for Trump, noting that his “positions have been known to change.”