(Olympia, WA) -- Both houses of the Washington legislature have passed a bill that bans the sale of assault weapons. The bill has been requested by Washington Attorney General Bob Ferguson since the 2016 mass shooting at a Mukilteo house party. The Senate made amendments that will require a vote in the House before the bill goes to the Governor, who's expected to sign it. The bill passed on a party line vote. Republicans say the ban won't address the problem. They say more programs for drug and mental health treatment are needed.