An unusual new provision, introduced by state Rep. Mary Elizabeth Coleman (R), would allow private citizens to sue anyone who helps a Missouri resident obtain an abortion out of state, using the novel legal strategy behind the restrictive law in Texas that since September has banned abortions in that state after six weeks of pregnancy.

Coleman has attached the measure as an amendment to several abortion-related bills that have made it through committee and are waiting to be heard on the floor of the House of Representatives.

Abortion rights advocates say the measure is unconstitutional because it would effectively allow states to enact laws beyond their jurisdictions, but the Republican-led Missouri legislature has been supportive of creative approaches to antiabortion legislation in the past. The measure could signal a new strategy by the antiabortion movement to extend its influence beyond the conservative states poised to tighten restrictions if the Supreme Court moves this summer to overturn its landmark precedent protecting abortion rights.