Stung by the recent passage of legislation that would expand requirements for instant federal background checks on New Mexico firearms purchasers, House Republicans are looking for a way to override the bill. Their solution: Employ an arcane provision in the state constitution that would send the question directly to voters in the next statewide general election, scheduled for 2020. The House of Representatives earlier this week voted almost totally along party lines to approve Senate Bill 8, moving the legislation to the desk of Gov. Michelle Lujan Grisham. She has said she will support such gun-control measures. House Republican leaders on Thursday sent a letter to Secretary of State Maggie Toulouse Oliver, asking her to use the constitutional referendum provision to place the question on the 2020 ballot.