US Sen. Elizabeth Warren plans to hold a Capitol Hill press conference Thursday on a marijuana bill she is co-sponsoring.

The bill, which she is co-sponsoring with Sen. Cory Gardner, a Colorado Republican, seeks to "ensure that each state has the right to determine for itself the best approach to marijuana within its borders," an advisory from Warren's office says.

The advisory adds that the bill "also extends these protections to Washington D.C., U.S. territories, and federally recognized tribes, and contains common-sense guardrails to ensure that states, territories, and tribes regulating marijuana do so safely."

The bill has been named "Strengthening the Tenth Amendment Through Entrusting States (STATES) Act."

The press conference is set for 10:45 am. Warren's office plans to stream it on her Facebook page.

Warren said earlier this year that she was working on the legislation, aimed at rolling back US Attorney General Jeff Sessions' move to rescind Obama-era guidelines. The guidelines called for the US Department of Justice to largely leave alone states that had legalized marijuana for recreational and medical use.

Massachusetts voters approved marijuana for medical use in 2012 and voted for a ballot question broadly legalizing marijuana for adults in November 2016.

There are currently more than two dozen medical marijuana dispensaries operating in Massachusetts, while state regulators with the Cannabis Control Commission are processing applications for retail pot shops that could open this summer.

Colorado, the first state to legalize marijuana in 2012, has had recreational marijuana since 2014.

Marijuana remains an illegal substance at the federal level.