Colorado residents next year will decide whether to allocate the state's electoral votes to the winner of the national popular vote in future presidential elections.

Colorado Secretary of State Jena Griswold’s (D) office said Thursday that opponents of the national popular vote had submitted a sufficient number of signatures to qualify a ballot measure that will appear on the 2020 ballot. Those opponents collected nearly 229,000 signatures to force the measure onto the 2020 ballot, far more than the 124,000 necessary.

If passed, the referendum would reverse a law approved this year by Colorado’s Democratic-controlled state legislature to join the National Popular Vote Interstate Compact.