Several Oklahoma lawmakers are looking to add hurdles for citizen-led groups to pass the type of state questions that legalized medical marijuana, expanded Medicaid and won voter support despite Republican leaders opposition in recent years.

More than a dozen bills up for consideration, all authored by GOP legislators, seek to either tighten requirements for citizen-led voter initiatives to get on the ballot or increase the threshold for some of the proposals to pass on election day.

These include proposals to:

ׇ• Require a majority of voters in two-thirds of Oklahoma counties to vote for some...