Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) doubled down on his opposition to enforcing federal marijuana laws on Thursday, noting that the substance is less dangerous than heroin and that states should move toward decriminalizing it.

Sanders called on Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE to reverse an expected decision to roll back an Obama-era policy giving states leeway to legalize recreational marijuana use.

"Marijuana is not the same as heroin. No one who has seriously studied the issue believes that marijuana should be classified as a Schedule 1 drug beside killer drugs like heroin," Sanders said in a statement.

"Quite the contrary. We should allow states the right to move toward the decriminalization of marijuana, not reverse the progress that has been made in recent years," he added.

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Sanders's statement comes after reports that Sessions plans to rescind the so-called Cole memo, written by then-Deputy Attorney General James Cole under former President Obama, which directed federal prosecutors to deprioritize marijuana-related offenses in states that have legalized recreational use of the substance.

The move by Sessions threatens the movement to legalize recreational marijuana use in several states, including, most recently, California, which began allowing recreational use on Monday.

So far, six states have approved marijuana for recreational use, and dozens allow marijuana for medical use. The substance, however, remains federally prohibited and is classified as a Schedule 1 controlled substance.

The Cole memo discouraged U.S. attorneys from prosecuting marijuana-related cases in states that have legalized the substance, paving the way for such laws to be implemented.