Elizabeth Warren, D-Mass., and Cory Gardner, R-Colo., are rarely on the same side of a hot-button issue. But the two senators shared a podium Thursday to launch new legislation on an issue they can agree on: keeping federal hands off state-legalized marijuana.

The two senators on Thursday unveiled bipartisan legislation that would protect marijuana users and businesses from federal interference in states that have legalized the drug. The legislation would allow states to pursue liberalized marijuana policies as they see fit, they said.

Warren said current federal prohibition on marijuana impedes effective marijuana treatments for medical patients and unjustly targets minority communities. Gardner described marijuana legalization as a matter of states’ rights.

Nine states have legalized recreational marijuana and another 20 have legalized the drug for medical use. But federal law still prohibits it.

“These are archaic laws that don’t just hurt individual people,” Warren said at the Thursday morning press conference. “They also prevent businesses who are in the marijuana business from getting access to banking services. That forces a multibillion dollar industry to operate all in cash. That’s bad for business and bad for safety.”