Three congressional lawmakers from California are accusing the U.S. Department of Justice of overreach in an ongoing crackdown against Harborside Health Center, widely considered to be the largest and one of the most well-respected medical marijuana dispensaries in the nation.

“We believe DOJ has overstepped its bounds in the Harborside case,” Reps. Dana Rohrabacher (R), Sam Farr (D) and Barbara Lee (D) wrote in a letter last week about U.S. Attorney Melinda Haag’s effort to shut down the Oakland, California-based Harborside. “We believe DOJ is not acting within the spirit or the letter of the law nor in the best interests of the people who depend on Harborside for reliable, safe medical marijuana.”

The letter notes that public acceptance of medical marijuana has grown nationally, even as federal policy on the substance “stagnates.” To highlight his support, Rohrabacher posed with Harborside’s co-founder and executive director, Steve DeAngelo, at the dispensary:

Twenty-three states so far have legalized marijuana for medical purposes, and 11 others have legalized limited medical use of a specific marijuana-derived compound. But the federal government continues to ban the plant, classifying it as one of the “most dangerous” substances with “no currently accepted medical use.”