LGBT rights experienced a watershed victory while the Trump administration suffered a defeat on Monday when the U.S. Supreme Court ruled that a longstanding federal law barring workplace discrimination, will now protect gay and transgender employees.

This land-mark 6-3 ruling represents the biggest moment for LGBT rights in the United States since the 2015 Supreme Court ruling that made same-sex marriage legal nationwide. Two votes from conservative justices came as a surprise when the conservative judges joined the court’s four liberals in this unprecedented ruling. The conservative judges who voted in favor of this are Neil Gorsuch, a 2017 Trump appointee who wrote the ruling, and Chief Justice John Roberts.

Title VII of the Civil Rights Act of 1964, the set of laws that bars employers from discriminating against employees on the basis of sex as well as race, color, national origin and religion, now also protects gay and transgender people.

Up until this ruling, there were still 28 U.S. states that lacked comprehensive measures against employment discrimination for employees who identify themselves as gay or transgender and essentially, made workplace bias against gay and transgender people legal.

This recent legal argument focused on the definition of “sex” in Title VII. It was established that the court agreed with the plaintiffs arguments, that it is illegal to discriminate against gay and transgender workers based on their sex.

LGBT activists, and the only surviving plaintiff, Gerald Bostock, applauded the court’s ruling but President Trump who, supported by evangelical Christian voters, has taken actions since taking office in 2017 that starkly undermine the rights of gay and transgender people said to reporters at the White Housse, “They’ve ruled and we live with their decision.”

Mr. Bostock had been a Georgia county government child welfare services coordinator that lost his job only months after joining a local gay-friendly Hotlanta Softball League.