A unanimous U.S. Supreme Court on Monday sent a clear message that plaintiffs bringing discrimination lawsuits under key civil rights laws now will face a high bar to winning federal court review of their claims.

That message, however, came with a separate warning from Justice Ruth Bader Ginsburg that the 1866 law at issue before the justices was “sweeping” and designed to “break down all discrimination between black men and white men” regarding “basic civil rights.” Attempts to “cabin” its scope, as advanced by the Trump administration’s Justice Department and others, “cannot be squared with the statute.”