There’s only one known instance of a church losing its tax-exempt status because it violated the Johnson Amendment, but Republicans have tried to get rid of it before.

The rule was introduced by former President Lyndon B. Johnson in 1954 when he was serving as the U.S. Senate majority leader. It banned all tax-exempt organizations like churches and charities from “directly or indirectly” participating in politics, specifically in endorsement or opposition of candidates.

The Internal Revenue Service agreed in a court filing that churches can endorse political candidates without fear of losing their tax-exempt status