Sens. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) and Cory Gardner Cory Scott GardnerCook Political Report shifts Colorado Senate race toward Democrat Overnight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE (R-Colo.) introduced a bipartisan bill on Thursday that would allow states to regulate marijuana without federal interference.

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Warren and Gardner, who both represent states with legal recreational pot, introduced the legislation, known as Strengthening the Tenth Amendment Through Entrusting States (STATES) Act, as a response to the Trump administration's hard-line stance against the drug.

The bill would amend the Controlled Substances Act to include a framework that says it no longer applies to those following state, territory or tribal laws “relating to the manufacture, production, possession, distribution, dispensation, administration, or delivery of [marijuana]."

"It’s time to reform American’s outdated marijuana policies," Warren tweeted with a video of her and Gardner speaking at a press conference announcing the measure.

It’s time to reform American’s outdated marijuana policies. Watch live as @SenCoryGarder and I discuss our new legislation that would let states, territories, & tribes decide for themselves how best to regulate marijuana – without federal interference. https://t.co/BVcvxomhld — Elizabeth Warren (@SenWarren) June 7, 2018

Gardner said outlawing legalized pot was like “putting the ketchup back in the bottle," and hit current finance laws for making it difficult for marijuana businesses, because the substance is illegal according to the federal government.

“This city of Denver, the state of Colorado, can collect taxes … they can take it to the bank,” Gardner said. “But if you’re in the business, if you work for the business, you can’t get a bank loan or set up a bank account because of the concern over the conflict between the state and federal law. We need to fix this public hypocrisy.”

Warren and Gardner had announced a partnership in April in an attempt to hold President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE to his word about respecting states rights.

Warren reportedly said the goal of the legislation is to “ensure that each state has the right to determine for itself the best approach to marijuana within its borders.”

Warren and Gardner's proposed legislation comes in the face of increasing opposition toward marijuana from the White House.

Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE, a vocal critic of marijuana legalization, in January rolled back an Obama-era policy that gave states freedom to manage recreational use.

In May 2017, he sent a letter to congressional leaders asking that they eliminate an amendment that prohibits the Justice Department from using federal money to prevent states "from implementing their own State laws that authorize the use, distribution, possession or cultivation of medical marijuana."

Recreational marijuana is legal in nine states and Washington, D.C., and medical marijuana is legal in another 29.