Introduced in the Senate in January 2107 by Republican Sen. Ron Johnson from Wisconsin, the Right to Try bill had 46 co-sponsors, all Republican except West Virginia Sen. Joe Manchin. It passed the Senate in August of that year and was sent to the House, where it passed on May 22, 2018 by a vote of 250-169. Only 22 Democrats voted for the bill. No Republicans voted against it.
Prior to the signing of the federal law, 41 states had passed Right to Try, beginning with Colorado in 2014.