Congress last year lifted a longstanding ban on use of public money to support medical marijuana in Washington, D.C., but now a pair of Republican lawmakers want to block implementation of the law.

The Washington Post reported June 23 that Reps. Jason Chaffetz (R-Utah) and Jim Jordan (R-Ohio) have filed a resolution to have Congress disapprove the law, which would otherwise go into effect in July. Congressional lawmakers blocked the law, approved by district residents in 1998, for more than a decade before relenting last year.

The Chaffetz/Jordan proposed joint resolution is not expected to pass, but the law could still be challenged through the budget process.