Federal gun laws that infringe on the right to keep and bear arms would be deemed null and void under legislation passed by the Missouri House.
The House voted 110-41 on Thursday to send the bill to the Senate. Senators passed a similar bill earlier this year, but both chambers need to approve an identical version to send the legislation to Gov. Jay Nixon.
The measure would give residents the right to sue federal agents for enforcing past, present and future laws that are considered infringements by the state.
Courts have ruled that states cannot nullify federal laws. Nixon, a Democrat, vetoed a similar bill last year over concerns it violated a part of the U.S. Constitution that gives federal laws precedence over conflicting state laws.