An Oregon congressman who is a chief backer of legalized marijuana is urging a fight against U.S. Attorney General Jeff Session's plan to open the gates to federal enforcement of laws against marijuana.

Rep. Earl Blumenauer, a Democrat who co-sponsored an amendment that prevents the Justice Department from interfering with states' medical marijuana programs, called the move outrageous.

He said anyone who cares about this issue should mobilize and push back strongly.

Oregon Gov. Kate Brown said rolling back federal marijuana policy, which has been largely non-interventionist, will disrupt the state's economy. She said over 19,000 jobs have been created by the marijuana market in Oregon, which was the first state to decriminalize personal possession in 1973, legalized medical marijuana in 1998, and recreational use in 2014.