(NBC News) A group of high-profile social conservatives warned Republican National Committee Chairman Reince Priebus in a letter this week that their supporters could abandon the GOP if the party seeks to change its position on social issues, particularly same-sex marriage.

Thirteen social conservatives, representing various influential groups, wrote Priebus ahead of the RNC’s quarterly meeting this week in Los Angeles to sternly rebuke the conclusions of a post-election report that advised Republican elected officials to adopt a softer tone toward social issues.

“We respectfully warn GOP Leadership that an abandonment of its principles will necessarily result in the abandonment of our constituents to their support,” concludes the letter, which was obtained by and independently verified by NBC News in advance of the meeting this week.

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