Tony Perkins, in an email sent to his supporters, criticized the Republican National Committee over a report released last month that suggested the party should reconsider its messaging on same-sex marriage to appeal to younger voters.

“Until the RNC and the other national Republican organizations grow a backbone and start defending core principles, don’t send them a dime of your hard-earned money,” Perkins said in the email, a copy of which was obtained by CNN.

“If you want to invest in the political process, and I encourage you to do so, give directly to candidates who reflect your values and organizations you trust — like FRC Action.”