A key senator released the Legislature’s first attempt at carrying out a constitutional amendment that broadly legalized medical marijuana, with the proposal calling for a growing number of marijuana licenses and making it easier for doctors to order the treatment for patients.

The bill by Sen. Rob Bradley, who was instrumental in passage of medical-marijuana laws in 2014 and 2016, came days after health officials published proposed regulations to implement the constitutional amendment, which received more than 71 percent approval from voters in November.